Reference Specimens
The Folch Collection

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Photos by Fabre Minerals. Under Creative Commons license

This page provides a selection of the specimensthat were in the Folch Collection that have passed through the Fabre Minerals website and, due to their quality,
rarity, or significance as specimens from interesting locations, have been preserved as reference specimens in #MVM
We hope that you enjoy your visit, even if it is just to see this page!

Carles Curto Text: Carles Curto (former Geology Museum, Barcelona curator) & Jordi Fabre
Assistance from John S. White (former Smithsonian curator) John S. White

 


The Folch Collection

The Folch Collection was known during the period 1960-1980 as one of the best private collections in the world. It was famous worldwide for its size (more than 15,000 specimens), the quality of the specimens, the large number of classic specimens which are now almost impossible to obtain, and the style of the collection, which is surprisingly 'modern'. Sr. Folch (Joaquín Folch Girona) collected during a period when the style of most collectors in Europe consisted of gathering large specimens of rare minerals, and in which esthetics and perfection were not that important. That said he actually tended to collect smaller specimens that were esthetic and, when possible, damage free. On the death of Sr. Folch, in 1984, the collection passed to his son Alberto, and when he in turn died it went to his grandson Joaquín Folch who wisely decided to keep the collection exactly as his grandfather had it (including the display cases). So the collection was kept together and its enormous historical value has not been lost.

While I was a teenager I had the luck to have been warmly invited by Sr. Folch to visit the collection. I made numerous visits, and with him beside me I obtained an enormous amount of mineralogical information which went far beyond what I would have learned anywhere else. Given this experience I have always had a strong connection with the collection.

During my ongoing contacts with the Folch family a moment arrived when they expressed their desire to update the collection so as to make it more current - since 1984 nothing new had been added so there was a significant gap in the minerals found since then. After lots of friendly and unhurried discussions the Folch family asked me to help them with this updating process. To do this we had the good fortune that the collection included many attractive duplicates. These duplicates do not add much to the Folch collection, as there are other examples of all of them, but given their unusual localities and/or high quality they still represent good commercial specimens.

So, for the first time, some of the duplicate specimens from the Folch Collection are emerging into the sunlight. Each one of them has hand written notes made by Sr. Folch himself as well as, in many cases, his personal label and number (in the case that they were part of the major collection). The duplicates will be sold during the shows that we normally attend, and also through our web site and store in Barcelona (you need to arrange a visit beforehand, which we will try to find a way of accommodating visitors)

This project will take us a long time, as the specimens available are numerous and neither the family nor I wish to make the choices too quickly. The idea is to work slowly and select the pieces in a very systematic and careful manner. We think that given the special characteristics of the specimens that will be available and their historical value this will be a great chance for many collectors to obtain pieces that would otherwise have remained pure dreams.

We hope that little by little we can satisfy all those that wish to acquire a duplicate from the Folch collection and we can assure them that this task will give us far more pleasure than simple economic benefits. Sr. Folch was my spiritual father in mineralogical terms so handling his minerals and helping to improve his collection with new purchases is a fantastic sensation for me because the profits gained from the sale of these duplicates are used to acquire more contemporary specimens, thus satisfying the family's desire to update the collection.

I cannot thank the Folch family enough for their good faith and for their wish to improve the collection. They are helped by the undeniable support and enthusiasm of Francisco Riquelme, the current conservator of the collection, and between them they have taken a step that many people have wished them to take and that will give great joy to collectors worldwide, as well as increasing interest in and knowledge of the Folch collection in Spain and the rest of the world.

 


1926: Mineralogical Society, Jubilee Celebration.
Sr. Folch is the third from the right in the first row on foot

 

 

 


Sr. Folch holding an Apatite from Panasqueira

 

 

 

 

Typical handwritten labels from the Folch Collection

 



Typical record from the Folch Collection

 

USA


Alaska

Epidote with Quartz
Epidote with Quartz.
Epidote with Quartz  

RL13M2: Doubly terminated Epidote crystal, with parallel growths and very sharp faces and edges. With small Quartz crystals.
Green Monster Mountain, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska  USA (±1954)

Specimen size: 3.6 × 2.1 × 2 cm = 1.42” × 0.83” × 0.79”

Main crystal size: 3.6 × 1.7 cm = 1.42” × 0.67”

With handwritten note from the Folch Collection (duplicates)
Epidote with Quartz
 

RZ8F8: A Prince of Wales classic. The long crystals of Epidote, apart from the perfect development of the faces, have a good degree of translucence and contrast with the numerous crystals of Quartz. Folch bought this from Al McGuinness in 1972 at Tucson.
Copper Mountain, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska  USA (±1972)

Specimen size: 6 × 5 × 3.3 cm = 2.36” × 1.97” × 1.30”

Main crystal size: 3.8 × 1.6 cm = 1.50” × 0.63”

With handwritten note & record from the Folch Collection (duplicates)
Epidote with Quartz.
Epidote with Quartz.

Arizona

Copper
Copper. Copper.
 

RV59H7: Extraordinary miniature. Faces and edges of the crystals have a very uncommon definition and the crystals forms are complex. Furthermore they are practically unaltered so they have an intense color and luster.
Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona  USA

Specimen size: 3.4 × 2.3 × 1.7 cm = 1.34” × 0.91” × 0.67”

Main crystal size: 0.6 × 0.5 cm = 0.24” × 0.20”

With record from the Folch Collection (duplicates)

Probably Opal intense fluorescence short UV
Copper
 

RD47K4: Arborescent growth of crystals very much better defined than usual in this kind of sample, perfectly conserved. On the back of the Schneider's label that is with the specimen is written the year 1969.
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona  USA (±1969)

Specimen size: 9.3 × 3.3 × 2.4 cm = 3.66” × 1.30” × 0.94”

Main crystal size: 0.5 × 0.5 cm = 0.20” × 0.20”

With handwritten note from the Folch Collection (duplicates)

Opal? intense fluorescence short UV & fluorescent long UV
Copper. Front
Front
Copper. Rear
Rear
Copper.
Ajoite with Shattuckite
Ajoite with Shattuckite. Ajoite with Shattuckite.
Ajoite with Shattuckite  

RX61M3: Well defined radially fibrous Shattuckite crystals accompanied by light blue Ajoite crystals in the small vugs of the sample (Ajoite specimens are usually massive)
One can read on the card that the specimen was purchased in 1959 from Scott J. Williams (Southwest Co.) of Scottsdale, Arizona. The piece is accompanied by a handwritten label and a card (Nr. 4988) from the Folch collection that we will send to the buyer.
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona  USA (±1959)

Specimen size: 5.5 × 4.7 × 3.2 cm = 2.17” × 1.85” × 1.26”

With handwritten note & record from the Folch Collection (duplicates)
Ajoite and Plancheite
Ajoite and Plancheite  

RY11AB7: Fibrous and crystalline Ajoite aggregates, on matrix, with a very deep and intense color. They are with Plancheite that has a clearer color. The sample is from the type locality for the species.
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona  USA (±1959)

Specimen size: 8.3 × 3.8 × 3 cm = 3.27” × 1.50” × 1.18”

Type locality

With handwritten note from the Folch Collection (duplicates)
Ajoite and Plancheite. Ajoite and Plancheite.
Cuprite (variety chalcotrichite) with Copper
Cuprite (variety chalcotrichite) with Copper. Cuprite (variety chalcotrichite) with Copper.
 

RC6K4: Fibrous aggregates of excellent luster and very intense red color on laminar growths of native Copper on matrix.
Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona  USA (±1973)

Specimen size: 7.7 × 6 × 5 cm = 3.03” × 2.36” × 1.97”

With handwritten note from the Folch Collection (duplicates)
Cuprite with Copper
 

RF13S7: Small crystals of Cuprite on an arborescent growth of native Copper. They are very sharp, with a dominant octahedron modified by smaller cube faces and are intensely sherry red and very bright.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA (±1964)

Specimen size: 1.7 × 1.3 × 0.8 cm = 0.67” × 0.51” × 0.31”

With handwritten note from the Folch Collection (duplicates)
Cuprite with Copper.
Cuprite with Copper
Cuprite with Copper. Front
Front
Cuprite with Copper. Rear
Rear
Cuprite with Copper.
Cuprite with Copper  

RM14AE6: Aggregates of small cubo-octahedral Cuprite crystals that are very bright, with dendritic growths of octahedral native Copper crystals. Both this kind of sample and the locality are American classics.
The sample is from the Joaquín Folch duplicates collection, whose label we’ll send to the buyer.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA

Specimen size: 3.8 × 3.1 × 1.8 cm = 1.50” × 1.22” × 0.71”

Main crystal size: 0.3 × 0.2 cm = 0.12” × 0.08”

With handwritten note from the Folch Collection (duplicates)
Cuprite with Copper
Cuprite with Copper  

RG60AE6: Aggregates of small cubo-octahedral Cuprite crystals that are very bright, with dendritic growths of octahedral native Copper crystals. Both this kind of sample and the locality are American classics.
The sample is from the Joaquín Folch duplicates collection, whose label we’ll send to the buyer.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA

Specimen size: 8.2 × 4.2 × 1.8 cm = 3.23” × 1.65” × 0.71”

Main crystal size: 0.2 × 0.2 cm = 0.08” × 0.08”

With handwritten note from the Folch Collection (duplicates)
Cuprite with Copper. Front
Front
Cuprite with Copper. Rear
Rear
Cuprite with Copper.
Cuprite
Cuprite. Cuprite.
 

RD96V0: Arborescent growths of copper covered by cubic crystals of Cuprite, translucent, bright and vivid red in color. Of excellent quality for the locality, a great North American classic.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA (±1964)

Specimen size: 9.3 × 6 × 1.5 cm = 3.66” × 2.36” × 0.59”

Main crystal size: 0.2 × 0.2 cm = 0.08” × 0.08”

With handwritten note from the Folch Collection (duplicates)
Cuprite (variety chalcotrichite) with Copper
Cuprite (variety chalcotrichite) with Copper  

RH6V0: Arborescent growths of crystals of native Copper on matrix, with mossy aggregates of very thin fibrous crystals of Cuprite (variety chalcotrichite), very bright and with deep red color.
We’ll send the Minerals Unlimited label to the buyer of the specimen.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA (±1963)

Specimen size: 6.8 × 5.5 × 2 cm = 2.68” × 2.17” × 0.79”

With handwritten note & record from the Folch Collection (duplicates)
Cuprite (variety chalcotrichite) with Copper. Cuprite (variety chalcotrichite) with Copper.
Cuprite (Chalcotrichite) with Copper
Cuprite (Chalcotrichite) with Copper. Front
Front
Cuprite (Chalcotrichite) with Copper. Rear
Rear
Cuprite (Chalcotrichite) with Copper.
Cuprite (Chalcotrichite) with Copper  

RD47R6: Coatings of feltlike crystals of Chalcotrichite, with very intense luster and red color, on a dendritic growth of flattened crystals of native Copper on matrix. An U.S. classic that Folch acquired in 1971 from the well known Swiss dealers Siber + Siber.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA (±1971)

Specimen size: 10.6 × 8 × 4.1 cm = 4.17” × 3.15” × 1.61”

With handwritten note from the Folch Collection (duplicates)
Cuprite (Chalcotrichite) with Copper
Cuprite (Chalcotrichite) with Copper  

RH47K8: Small but numerous groups of fibrous Cuprite crystals (Chalcotrichite), very bright and vivid red in color, on laminar growths of native Copper on matrix. The locality, a classic for Chalcotrichite (and for native Copper), makes this specimen even more interesting.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA (±1971)

Specimen size: 12.2 × 7.4 × 4 cm = 4.80” × 2.91” × 1.57”

With handwritten note from the Folch Collection (duplicates)
Cuprite (Chalcotrichite) with Copper. Front
Front
Cuprite (Chalcotrichite) with Copper. Rear
Rear
Cuprite (Chalcotrichite) with Copper.
Copper
Copper. Copper.
 

RB27I2: Dendritic growth of crystals, some of them very well defined, bright and with small coverage of Quartz.
Ray Mines, Scott Mountain area, Mineral Creek District, Dripping Spring Mountains, Pinal County, Arizona  USA

Specimen size: 13.8 × 9.5 × 3 cm = 5.43” × 3.74” × 1.18”

Main crystal size: 2.1 × 0.8 cm = 0.83” × 0.31”

With handwritten note from the Folch Collection (duplicates)
Copper
 

RL64L9: A miniature from a classic locality. Arborescent growth of Copper crystals, some of them well defined.
The piece is accompanied by a handwritten label from the Folch collection that we will send to the buyer.
Bisbee, Warren District, Mule Mountains, Cochise County, Arizona  USA

Specimen size: 3.5 × 2.4 × 2.3 cm = 1.38” × 0.94” × 0.91”

With handwritten note from the Folch Collection (duplicates)

Fluorescent short UV
Copper.
Copper with Cuprite
Copper with Cuprite.
Copper with Cuprite.
 

RP38F8: Aerial growth of crystals of Cuprite (cube + dodecahedra) with slightly curved edges and on a matrix of native copper crystals. It was a 1961 gift from Mr. Albert Haag, of Tucson, as shown on the record for this one.
Bisbee, Warren District, Mule Mountains, Cochise County, Arizona  USA (±1961)

Specimen size: 3.4 × 2.3 × 1.9 cm = 1.34” × 0.91” × 0.75”

Main crystal size: 0.6 × 0.4 cm = 0.24” × 0.16”

With handwritten note & record from the Folch Collection (duplicates)
Cuprite with Copper
Cuprite with Copper  

RA60V0: Groups of small octahedral crystals of Cuprite with sharp faces and edges and with intense red color. They are on a matrix of massive Cuprite and with thick growths of Copper.
With a label of the legendary company Foote that we'll send to the buyer.
Copper Queen Mine, Queen Hill, Bisbee, Warren District, Mule Mountains, Cochise County, Arizona  USA (±1952)

Specimen size: 6.1 × 3.6 × 3.1 cm = 2.40” × 1.42” × 1.22”

Main crystal size: 0.3 × 0.3 cm = 0.12” × 0.12”

With handwritten note from the Folch Collection (duplicates)
Cuprite with Copper.
Cuprite with Copper. Cuprite with Copper.
Calcite with Brochantite
Calcite with Brochantite.
Calcite with Brochantite  

RB59M3: Group of complex Calcite crystals, translucent and with a intense brilliance, accompanied by centered acicular green Brochantite crystal growths.
This sample was purchased from Hugh A. Ford, of New York, in 1959. The piece is accompanied by a handwritten label and a card (Nr. 2974) from the Folch Collection.
Bisbee, Warren District, Mule Mountains, Cochise County, Arizona  USA (±1959)

Specimen size: 3.7 × 3.3 × 2.7 cm = 1.46” × 1.30” × 1.06”

Main crystal size: 0.7 × 0.6 cm = 0.28” × 0.24”

With handwritten note & record from the Folch Collection (duplicates)

Minor fluorescence long & short UV
Wulfenite with Mimetite
Wulfenite with Mimetite  

RQ86M0: Very well defined Wulfenite crystals, with an excellent color and luster and on matrix.
The specimen is accompanied by an old label from the “Antigua Casa Soler y Pujol” (old Soler & Pujol establishment) an antique Natural Science materials supplier from Barcelona. On the back side of the label appears a handwritten note from Mr. Folch where he was recording that he bought the specimen in 1953.

Mammoth-St. Anthony Mine, St. Anthony deposit, Tiger, Mammoth District, Pinal County, Arizona  USA (±1953)

Specimen size: 4.5 × 4.5 × 2.8 cm = 1.77” × 1.77” × 1.10”

Main crystal size: 0.9 × 0.7 cm = 0.35” × 0.28”

With handwritten note from the Folch Collection (duplicates)
Wulfenite with Mimetite. Wulfenite with Mimetite.
Wulfenite with Mimetite
Wulfenite with Mimetite. Front
Front
Wulfenite with Mimetite. Rear
Rear
Wulfenite with Mimetite  

RJ38H0: A group of laminar crystals of intense orange-yellow color, very bright and partially covered by orange Mimetite. The mine is now an American classic. The piece has an important “pedigree” because it has a label showing a double provenance: The Scott J. Williams collection, of Arizona, and the C.J. Hansen collection where the piece was originally.
Mammoth-St. Anthony Mine, St. Anthony deposit, Tiger, Mammoth District, Pinal County, Arizona  USA (±1957)

Specimen size: 7.2 × 6.3 × 3.8 cm = 2.83” × 2.48” × 1.50”

Main crystal size: 1.3 × 1.2 cm = 0.51” × 0.47”

With handwritten note from the Folch Collection (duplicates)
Dioptase with Wulfenite
 

RB27F8: From the Mammoth Mine, no less! A group of Dioptase crystals with magnificent color, on matrix, and with the rare feature of some Wulfenite.
Mammoth-St. Anthony Mine, St. Anthony deposit, Tiger, Mammoth District, Pinal County, Arizona  USA (±1959)

Specimen size: 3.3 × 2.4 × 1.8 cm = 1.30” × 0.94” × 0.71”

With handwritten note & record from the Folch Collection (duplicates)

Calcite fluorescent long & short UV
Dioptase with Wulfenite.
Dioptase with Wulfenite.
Wulfenite
Wulfenite.
Wulfenite  

RL87F8: A classic from the Red Cloud Mine. Two crystals that have excellent brilliance and color and that are on matrix. From the 1970s finds, which is when he bought it.
Red Cloud Mine, Trigo Mountains, Silver District, La Paz County, Arizona  USA

Specimen size: 2.5 × 2 × 1.5 cm = 0.98” × 0.79” × 0.59”

With handwritten note & record from the Folch Collection (duplicates)

Arkansas

Twinned Rutile
 

RC37F8: A magnificent cyclic twin from the classic Magnet Cove locality. The perfect twin! A floater as the base has recrystallized. The typed Schortmann’s Minerals label also has some handwritten notes made by Folch.
Magnet Cove, Hot Spring County, Arkansas  USA (±1956)

Specimen size: 2.6 × 2.4 × 2.9 cm = 1.02” × 0.94” × 1.14”

With handwritten note & record from the Folch Collection (duplicates)
Twinned Rutile.

California

Linarite
Linarite. Linarite.
Linarite  

RP63M0: Uncommon specimen from a classic locality formed by small acicular and bladed Linarite crystals on matrix.
The specimen is accompanied by a Lidstrom’s label.
Blue Bell Mine, Baker, Soda Lake Mountains, San Bernardino County, California  USA

Specimen size: 5.8 × 4.4 × 2.5 cm = 2.28” × 1.73” × 0.98”

Main crystal size: 0.5 × 0.1 cm = 0.20” × 0.04”

With handwritten note from the Folch Collection (duplicates)
Caledonite with Linarite
Caledonite with Linarite  

RB18G2: A sample from a very uncommon locality that we must not confuse with the better known Mammoth-St. Anthony mine. Caledonite, greenish-blue and vitreous, is with Linarite and they are very abundant on the Limonite matrix. This specimen was purchased from Burminco (George Burnham)
Baker, Soda Lake Mountains, San Bernardino County, California  USA (±1955)

Specimen size: 8 × 6.3 × 5.2 cm = 3.15” × 2.48” × 2.05”

With handwritten note & record from the Folch Collection (duplicates)
Caledonite with Linarite.
Caledonite with Linarite. Caledonite with Linarite.
Elbaite
Elbaite. Front
Front
Elbaite. Rear
Rear
Elbaite  

RC48M2: Very well defined Elbaite, very transparent, with extraordinary colors ranging from a lively red to intense pink from the middle to the upper perfect terminal faces. The specimen which by its aspect does not seem, at first glance, from Pala, is accompanied by a handwritten note from Sr. Folch where one can read that it was collected in Pala (California) by Sr. Folch in person, in 1974, so we give credence to the locality.
Pala Chief Mine, Chief Mountain, Pala, Pala District, San Diego County, California  USA (02/1974)

Specimen size: 4.1 × 1.4 × 1.2 cm = 1.61” × 0.55” × 0.47”

With handwritten note from the Folch Collection (duplicates)
Elbaite (variety rubellite) with Quartz
 

RA36Z4: Radiating aggregates on a Quartz matrix of bright translucent crystals with an intense pink color. Really an "oldie" from Pala, typical of the end of the 70's.
Pala District, San Diego County, California  USA (±1973)

Specimen size: 7.2 × 5.3 × 2.8 cm = 2.83” × 2.09” × 1.10”

Main crystal size: 3.4 × 0.3 cm = 1.34” × 0.12”

With handwritten note from the Folch Collection (duplicates)
Elbaite (variety rubellite) with Quartz.
Spodumene (variety kunzite)
Spodumene (variety kunzite). Front
Front
Spodumene (variety kunzite). Top
Top
 

FA47K0: Floater doubly terminated crystal with dissolution forms and anomaly growths. Its color is exceptionally intense. The original label notes that the specimen was sold to Sr. Folch by Mr. Bouest (or Bouert), from Los Angeles, October 1962.
Pala Chief Mine, Chief Mountain, Pala, Pala District, San Diego County, California  USA (±1962)

Specimen size: 4.1 × 4 × 2.5 cm = 1.61” × 1.57” × 0.98”

With record from the Folch Collection (duplicates)

Minor fluorescence with long & short UV
Spodumene (variety kunzite)
 

RC13K9: Floater and doubly terminated Spodumene crystal with multiple terminations at both ends. Pink color, with a strong dichroism.
Pala Chief Mine, Chief Mountain, Pala, Pala District, San Diego County, California  USA (±1962)

Specimen size: 5.2 × 2.8 × 1.2 cm = 2.05” × 1.10” × 0.47”

With handwritten note from the Folch Collection (duplicates)

Minor fluorescence long & short UV
Spodumene (variety kunzite). Front
Front
Spodumene (variety kunzite). Rear
Rear
Spodumene (variety kunzite)
Spodumene (variety kunzite). Front
Front
Spodumene (variety kunzite). Rear
Rear
 

FB36K0: Floater doubly terminated crystal with rounded terminations. The color is good and especially intense on the extremities of the crystal.
Pala Chief Mine, Chief Mountain, Pala, Pala District, San Diego County, California  USA (±1962)

Specimen size: 5.7 × 2.8 × 1.3 cm = 2.24” × 1.10” × 0.51”

With handwritten note from the Folch Collection (duplicates)

Minor fluorescence with long & short UV
Rutile
 

TY11I8: Prismatic crystal with very well defined faces and edges. It is sharp, bright and dark brown.
Champion Mine, White Mountain Peak, White Mountains, Mono County, California  USA (±1959)

Specimen size: 1.5 × 1.5 × 1.3 cm = 0.59” × 0.59” × 0.51”

With handwritten note from the Folch Collection (duplicates)
Rutile.
Rutile
Rutile.
 

TX10I8: Prismatic crystal with very well-defined faces and edges. It has translucent reddish zones. The crystal is partially covered by matrix.
Champion Mine, White Mountain Peak, White Mountains, Mono County, California  USA (±1959)

Specimen size: 1.7 × 1.3 × 1.4 cm = 0.67” × 0.51” × 0.55”

With handwritten note from the Folch Collection (duplicates)
Inesite
Inesite  

RP49J1: Specimen of good color and good crystallization from this locality, classic for Inesite.
The specimen is accompanied by a Lidstrom’s label.
Hale Creek Mine, Mad River Rock, Coastal Range, Trinity County, California  USA (±1973)

Specimen size: 6.8 × 5.8 × 3.4 cm = 2.68” × 2.28” × 1.34”

Main crystal size: 1.5 × 0.8 cm = 0.59” × 0.31”

With handwritten note from the Folch Collection (duplicates)
Inesite.
Inesite.
Andradite
Andradite.
Andradite  

RE16G6: Crystals reach a considerable size and have an excellent luster. They show equal development of rhombohedral and trapezohedral forms, with some other faces of the cubic system. One of the crystals has a contact on one of its faces. A good sample from this classic American locality.
Calaveras County, California  USA (±1958)

Specimen size: 4.7 × 3.7 × 2.9 cm = 1.85” × 1.46” × 1.14”

Main crystal size: 3.4 × 2.7 cm = 1.34” × 1.06”

With handwritten note & record from the Folch Collection (duplicates)
Cristobalite with Tridymite and Fayalite on Obsidian
Cristobalite  with Tridymite and Fayalite on Obsidian  

RP96S7: Small olive green laminar crystals of Fayalite in a spherical nodule of Cristobalite with Tridymite included in obsidian. The crystals have not been analyzed but the attribution is supported by an original label from Burminco (George Burnham), that we consider trustworthy.
Coso Hot Springs deposit, Coso Hot Springs, Coso District, Inyo County, California  USA (±1964)

Specimen size: 7.2 × 4.5 × 4.7 cm = 2.83” × 1.77” × 1.85”

With handwritten note from the Folch Collection (duplicates)
Cristobalite  with Tridymite and Fayalite on Obsidian. Cristobalite  with Tridymite and Fayalite on Obsidian.
Axinite-(Fe) with Amphibole
Axinite-(Fe) with Amphibole. Front
Front
Axinite-(Fe) with Amphibole. Rear
Rear
 

RE61M5: Sharp crystals, brown with mauve shades, with an indeterminate amphibole that forms aggregates of acicular green crystals. We investigated the locality to document it more precisely but we haven’t found more details or similar comparative material, so we retain the name furnished by Folch documentation.
Mariposa County, California  USA

Specimen size: 3.7 × 3 × 3.5 cm = 1.46” × 1.18” × 1.38”

Main crystal size: 3 × 1.4 cm = 1.18” × 0.55”

With handwritten note from the Folch Collection (duplicates)
Lawsonite
Lawsonite  

RX14G2: An old sample from a very uncommon locality that we must not confuse with the type locality (Tiburon Peninsula). Pink crystals are well developed on a Glaucophane matrix. The sample was collected by Scott J. Williams (Scottsdale, Arizona) in 1948 and it was purchased from him by Folch in 1961.
Valley Ford, Sonoma County, California  USA (1948)

Specimen size: 3.5 × 3.2 × 3 cm = 1.38” × 1.26” × 1.18”

Main crystal size: 0.7 × 0.6 cm = 0.28” × 0.24”

With handwritten note & record from the Folch Collection (duplicates)
Lawsonite.
Artinite
Artinite. Artinite.
Artinite  

RT14Z4: Globular growths of white, silky and bright Artinite crystals coating an Antigorite (variety serpentine) matrix.
Artinite Pit, Clear Creek, Picacho Peak, New Idria District, Diablo Range, San Benito County, California  USA (±1965)

Specimen size: 7.5 × 6.5 × 4.1 cm = 2.95” × 2.56” × 1.61”

With handwritten note & record from the Folch Collection (duplicates)

Minor fluorescence short UV

Colorado

Pyrite
 

RA12N4: From an American classic locality. Although originally labeled as Bravoite in reference to the grayish coating on Pyrite crystals, our analysis didn't confirm the existence of Bravoite. Subsequent consultations also confirm that it is not Bravoite and, even knowing that similar specimens could also contain Molybdenite, this species didn't appear in our analysis.
Gilman, Gilman District, Eagle County, Colorado  USA

Specimen size: 5.2 × 3.6 × 3 cm = 2.05” × 1.42” × 1.18”

With handwritten note from the Folch Collection (duplicates)
Pyrite. Front
Front
Pyrite. Side
Side
Rhodochrosite with Quartz
Rhodochrosite with Quartz.
 

RE87H0: A nice group of lenticular crystals with scaled surface, very typical of the historic find in the American Tunnel mine. They are partially covered by micro-crystals of Quartz and their color and luster are magnificent.
Sunnyside Mine group (American Tunnel Mine), Bonita Peak, Gladstone, Eureka District, San Juan County, Colorado  USA (±1966)

Specimen size: 2.8 × 2.6 × 1.9 cm = 1.10” × 1.02” × 0.75”

Main crystal size: 1.2 × 0.6 cm = 0.47” × 0.24”

With handwritten note from the Folch Collection (duplicates)
Rhodochrosite with Quartz
 

RA46H0: Two rhombohedral crystals with very sharp faces and edges on a white matrix of small Quartz crystals. Color is good for the locality which we must point out is historic.
Sunnyside Mine group (American Tunnel Mine), Bonita Peak, Gladstone, Eureka District, San Juan County, Colorado  USA (±1966)

Specimen size: 3.5 × 2 × 1.5 cm = 1.38” × 0.79” × 0.59”

Main crystal size: 1.8 × 1.6 cm = 0.71” × 0.63”

With handwritten note from the Folch Collection (duplicates)
Rhodochrosite with Quartz.
Rhodochrosite on Quartz
Rhodochrosite on Quartz.
Rhodochrosite on Quartz.
 

RB97F9: Spheroidal aggregates of lenticular crystals with an intense pink color, contrast with the white Quartz matrix. The Color and brightness are better than usual in the samples from this historical mine.
Sunnyside Mine group (American Tunnel Mine), Bonita Peak, Gladstone, Eureka District, San Juan County, Colorado  USA

Specimen size: 5 × 3.3 × 2 cm = 1.97” × 1.30” × 0.79”

Main crystal size: 1.2 × 1.1 cm = 0.47” × 0.43”

With handwritten note & record from the Folch Collection (duplicates)
Hübnerite
 

RK70H0: An excellent classic, with very sharp crystals in groups of parallel growths, with the best color and luster and an esthetic contrast with the snowy white matrix. A very difficult specimen to find today.
Adams Mine, Cement Creek, Silverton, Eureka District, San Juan County, Colorado  USA

Specimen size: 5.1 × 3.4 × 4.5 cm = 2.01” × 1.34” × 1.77”

Main crystal size: 3 × 1.6 cm = 1.18” × 0.63”

With handwritten note from the Folch Collection (duplicates)
Hübnerite. Front
Front
Hübnerite. Rear
Rear
Hübnerite.
Hübnerite with Quartz
Hübnerite with Quartz. Front
Front
Hübnerite with Quartz. Rear
Rear
Hübnerite with Quartz  

RT89J1: Specimen from a classic locality, very different from those from other well known localities for Hübnerite. Crystals are extraordinarily flat and bright and form almost leafy aggregates. The color is bronze-red, typical of its place of origin and contrasts with the white concretions of Quartz.
Adams Mine, Cement Creek, Silverton, Eureka District, San Juan County, Colorado  USA (±1955)

Specimen size: 8.7 × 6.5 × 3.5 cm = 3.43” × 2.56” × 1.38”

With handwritten note from the Folch Collection (duplicates)
Microcline (variety amazonite)
Microcline (variety amazonite)  

RA38F9: In this single crystal the color is magnificent, and the faces are exceptionally well-developed.
Pikes Peak, El Paso County, Colorado  USA (±1926)

Specimen size: 4.5 × 3.9 × 4.3 cm = 1.77” × 1.54” × 1.69”

With handwritten note & record from the Folch Collection (duplicates)
Microcline (variety amazonite). Front
Front
Microcline (variety amazonite). Top
Top
Microcline (variety amazonite) "whitecap"
Microcline (variety amazonite) "whitecap". Front
Front
Microcline (variety amazonite) "whitecap". Top
Top
Microcline (variety amazonite) "whitecap"  

RL27K9: Amazonite crystal with a second crystallization phase, known as “whitecap” (or white termination), the top side of the amazonite is this color.
Pikes Peak, El Paso County, Colorado  USA (±1964)

Specimen size: 8.1 × 5.9 × 3.3 cm = 3.19” × 2.32” × 1.30”

With handwritten note & record from the Folch Collection (duplicates)
Topaz
 

RY96M2: A colorless topaz specimen with an irregular growth but with well defined faces and edges. We would like to emphasize the locality, very unusual for good sized Topaz crystals.
Pikes Peak, El Paso County, Colorado  USA

Specimen size: 5.6 × 3.7 × 1.4 cm = 2.20” × 1.46” × 0.55”

With handwritten note from the Folch Collection (duplicates)
Topaz.
Hummerite
Hummerite.
Hummerite  

RK64J1: The specimen, from the type locality, is very representative of this rare vanadate. It forms deep orange microcrystals on matrix.
We will send the label of the sample, from Minerals Unlimited, Berkeley, California, to the buyer.
Hummer Mine, Paradox Valley, Uravan District, Montrose County, Colorado  USA (±1959)

Specimen size: 4.6 × 4.6 × 2.2 cm = 1.81” × 1.81” × 0.87”

With handwritten note from the Folch Collection (duplicates)

Maine

Grossular with Calcite
 

RG86G0: Crystals have the dodecahedral form and they are bright and sharp, standing on a Calcite matrix.
The specimen proceeds from the A. Santos collection and it passed to Folch collection in 1952.
Phippsburg, Sagadahoc County, Maine  USA

Specimen size: 5.3 × 4.7 × 3 cm = 2.09” × 1.85” × 1.18”

Main crystal size: 1.3 × 0.9 cm = 0.51” × 0.35”

With handwritten note & record from the Folch Collection (duplicates)
Grossular with Calcite.
Beryllonite
Beryllonite.
Beryllonite  

RA97F8: From the type locality for this rare species. While not well-defined (as is typical for Beryllonite) one can see the faces of the crystal, which is notable for its transparency. A floater.
Stoneham, Oxford County, Maine  USA (±1965)

Specimen size: 2.1 × 1.8 × 1 cm = 0.83” × 0.71” × 0.39”

With handwritten note & record from the Folch Collection (duplicates)

Type locality

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