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This one appeals to me because it is unusual. The Calcite crystals, which are very well defined, doubly terminated, and clear, appear to be randomly spread across the dark matrix.
Minerva I Mine, Ozark-Mahoning group, Cave-in-Rock Sub-District, Hardin County, Illinois USA (±1980)
Specimen size: 8.8 × 6 × 6.5 cm = 3.46” × 2.36” × 2.56”
Price: [SOLD]

11TP46: Calcite epitactic Rhodochrosite, Sphalerite, Pyrite

Rich group of Calcite crystals in epitactic growth on Rhodochrosite. The rhodochrosite acted as a substrate which controlled the shapes and orientations of the younger Calcite crystals. The specimen is completed by crystals of Sphalerite which form the matrix, and tiny crystals of Pyrite sprinkled between the white Calcite crystals.
Quiruvilca Mine (La Libertad Mine), Quiruvilca District, Santiago de Chuco Province, La Libertad Department Peru (01-02/2016)
Specimen size: 6.8 × 4.2 × 4.5 cm = 2.68” × 1.65” × 1.77”

Main crystal size: 0.5 × 0.2 cm = 0.20” × 0.08”
Price: €130 / US$138 / ¥21210 / AUD$210

SE97AC7: Calcite on Aragonite and Sulfur

Aggregate of very flattened Aragonite crystals with their characteristic pseudohexagonal shape. The surfaces of their faces are coated by small Calcite crystals and they have deformed Sulfur crystals on the back. As is the case with so many specimens in this collection, in this case a great Italian classic, the sample is of great quality for the locality.
Cozzo Disi Mine, Casteltermini, Agrigento (Girgenti) Province, Sicily Italy
Specimen size: 12.8 × 9.7 × 3.3 cm = 5.04” × 3.82” × 1.30”
Price: [SOLD]

NC9F2: Calcite on Baryte

On a base of laminar Baryte there are two curious groups of Calcite crystals; they look like sprays and their gray color contrasts well with the white matrix.
Emilio Mine, 'zona intermedia', Obdulia vein, Caravia mining area, La Rubiera, Loroñe, Colunga, Comarca de la Sidra, Principality of Asturias (Asturias) Spain (09-11/2004)
Specimen size: 9 × 8 × 4 cm = 3.54” × 3.15” × 1.57”

Main crystal size: 3.2 × 3 cm = 1.26” × 1.18”
Price: [SOLD]

HM80NB: Calcite on Dolomite

Group of Calcite crystals, one of them clearly dominant, rounded, with scalenohedral and rhombohedral faces, transparent, lustrous, with a more yellow color than usual, and with Dolomite crystals.
La Florida mining area, Herrería-Valdáliga-Rionansa, Comarca Costa Occidental/Saja-Nansa, Cantabria Spain
Specimen size: 7.9 × 3.9 × 2 cm = 3.11” × 1.54” × 0.79”
Price: €80 / US$85 / ¥13050 / AUD$130

ET60E4: Calcite on Dolomite

I think the photo says more than I can explain. The white crystals are not what they look like: they are Calcite, so don’t be mistaken. The brown ones are what they look like: Dolomite.
Roata Mine, Cavnic, Maramures Romania (2004)
Specimen size: 3.5 × 3.4 × 2.9 cm = 1.38” × 1.34” × 1.14”
Price: [SOLD]

JA76E7: Calcite on Prehnite

There is good contrast between the yellow Calcite and the green spherical Prehnite. The crystals of calcite are well positioned on the Prehnite matrix and the overall effect is delicate and soothing. A very fine specimen.
Malad quarry, Bombay, Maharashtra India (±2003)
Specimen size: 11.5 × 7 × 6 cm = 4.53” × 2.76” × 2.36”
Price: [SOLD]

TA26AN0: Calcite on Quartz

Very acute crystal of Calcite totally covered by a second generation of globular Calcite with gray tones and located very aerially on a matrix of white Quartz crystals. Very original and different from other pieces from this mining district.
Boldut Mine, Cavnic mining area, Cavnic, Maramures Romania
Specimen size: 6.5 × 4.4 × 4.3 cm = 2.56” × 1.73” × 1.69”

Main crystal size: 4 × 1.7 cm = 1.57” × 0.67”
Price: [SOLD]

RR46G0: Calcite on Quartz

Excellent representation of Calcite from Guanajuato. The specimen is especially esthetic due to the aerial position of flat rhombohedral crystals, with a lenticular habit, on a matrix of lightly violet Quartz.
Guanajuato, Guanajuato Mexico (±1967)
Specimen size: 5.7 × 5.3 × 3.6 cm = 2.24” × 2.09” × 1.42”
Price: [SOLD]

SM80NX: Calcite on Quartz

Spheroidal aggregates of Calcite with dark inclusions, on a Quartz matrix. Unusual for the locality.
Former collection of Miguel David Martínez. Number 611
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia) Spain
Specimen size: 3.3 × 3 × 2.5 cm = 1.30” × 1.18” × 0.98”
Price: [SOLD]

TC93Z9: Calcite on Quartz (variety amethyst) and Hematite

Sharp scalenohedral crystals with very well defined faces and edges, partially coated by small Quartz (amethyst) crystals and implanted on a cavity of the same mineral but with larger crystals. A sample special for the exhibit case, very elegant.
Ametista do Sul, Alto Uruguai region, Rio Grande do Sul Brazil (2011)
Specimen size: 15.2 × 10.9 × 7 cm = 5.98” × 4.29” × 2.76”
Price: €780 / US$830 / ¥127260 / AUD$1280

TP6AF7: Calcite on Quartz (variety chalcedony)

White spherical Calcites with crystalline overgrowths that show three faces of a rhombohedron and extensions forming a three-pointed star. The Calcite spheres have grown on Quartz (chalcedony variety) with a very pale blue color.
The sample is from the collection of La Unión area minerals of Alain Martaud, whose label we’ll send to the buyer.
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia) Spain
Specimen size: 8 × 4 × 3.9 cm = 3.15” × 1.57” × 1.54”

Main crystal size: 1.6 × 1.5 cm = 0.63” × 0.59”
Price: [SOLD]

ME63Y9: Calcite on Rhodochrosite

Divergent sprays of white acicular Calcite crystals contrasting nicely on a crystalline Rhodochrosite matrix with a very intense pink color. Different
Boldut Mine, Cavnic mining area, Cavnic, Maramures Romania (1993)
Specimen size: 3.2 × 2.8 × 1.5 cm = 1.26” × 1.10” × 0.59”
Price: [SOLD]

TPM76AO0: Calcite replaced by sand

Group of crystals, with one of them clearly dominant and all of them doubly terminated, totally occupied by inclusions of sand. They are formed by a prism with curved edges and a poorly defined terminal rhombohedron. An American classic which it is currently very difficult to obtain in good specimens as the area in which they were found has been declared a National Park.
Rattlesnake Butte, Jackson County, South Dakota USA
Specimen size: 9.3 × 6.7 × 4.5 cm = 3.66” × 2.64” × 1.77”

Main crystal size: 7.6 × 3 cm = 2.99” × 1.18”
Price: €160 / US$170 / ¥26100 / AUD$260

TA58H2: Calcite replacing Mercenaria sp

This kind of “boat” is a fossilized shell of Mercenaria sp, the interior of which is now occupied by honey-colored Calcite crystals filling most of the available inner space. The Calcite crystals “borrowed” calcium from Mercenarias for their growth.
Ruck's pit, Fort Drum, Okeechobee County, Florida USA (2003)
Specimen size: 5.3 × 3.3 × 3.6 cm = 2.09” × 1.30” × 1.42”
Price: [SOLD]

TX97AH3: Calcite with Aragonite

You can opine, perhaps, that Calcite is a “modest” species, but it can also reach unexpected heights of elegance as in the case of this complete crystal that is clear, colorless, very rich in faces and has additional elongated Calcite and Aragonite crystals with curious parallel growths. Due to its special transparency, the Calcite crystal has a high birrefringence that allows one to see “double” images through it.
Verkhnii Mine, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai Russia
Specimen size: 4.4 × 3.7 × 2.9 cm = 1.73” × 1.46” × 1.14”

Main crystal size: 4.4 × 3.2 cm = 1.73” × 1.26”
Price: €280 / US$298 / ¥45680 / AUD$450

RG12X8: Calcite with Aurichalcite inclusions (variety zeiringite)

Parallel banded growths of Calcite, very rich with oriented bluish-green Aurichalcite inclusions.
Solita Mine, Peramea, Baix Pallars, Comarca Pallars Sobirà, Lérida / Lleida, Catalonia / Catalunya Spain
Specimen size: 9.2 × 5.8 × 5.3 cm = 3.62” × 2.28” × 2.09”
Price: [SOLD]

TFR74AQ1: Calcite with Baryte

Calcite crystals, many of them doubly terminated and one of them clearly dominant and very aerial, with a prism with slightly curved edges and pinacoidal terminations, transparent, lustrous, on matrix, with Baryte. The specimen is of much higher quality than usual in this mine, and comes from the collection of William Severance, previously in that of Clarence Bement.
Greenside Mine, Patterdale, Eden District, former Cumberland, Cumbria England / United Kingdom
Specimen size: 7 × 4.5 × 3 cm = 2.76” × 1.77” × 1.18”

Main crystal size: 3 × 0.8 cm = 1.18” × 0.31”
Price: [SOLD]

VJ8G8: Calcite with Baryte

Nice miniature with a sharp rhombohedral crystal being the base of a group of aerial, tabular crystals of Baryte.
Moscona Mine, El Llano, Solís, Corvera de Asturias, Comarca Avilés, Principality of Asturias (Asturias) Spain
Specimen size: 3.5 × 3 × 2.1 cm = 1.38” × 1.18” × 0.83”
Price: [SOLD]

JFD84AO0: Calcite with Baryte and Pyrite

Very interesting specimen for this mine because the very aesthetic Calcite crystals sit on large Baryte crystals coated by what look like orange iron oxides and are accompanied by small Pyrite crystals. Baryte is not a common mineral in El Hammam, I have rarely seen it there, much less in large crystals as in this case. As sometimes happens, I didn't buy it in Morocco but in Tucson 2009, from the Moroccan Ahmed Es Seouani.
El Hammam, Ait Mimoune, Khémisset Province, Rabat-Salé-Kénitra Region Morocco (11/2008)
Specimen size: 9 × 8.2 × 7.7 cm = 3.54” × 3.23” × 3.03”

Main crystal size: 1.7 × 1.4 cm = 0.67” × 0.55”
Price: €280 / US$298 / ¥45680 / AUD$450

SM480NF: Calcite with Baryte, Dolomite and Fluorite

Complex crystals of Calcite, translucent, bright, yellow in color and on matrix, with Baryte, Dolomite and Fluorite. The yellow color of the Baryte and the general appearance of the piece is different from what is usual at this mine and corresponds to a small vug from which few pieces emerged.
Moscona Mine, El Llano, Solís, Corvera de Asturias, Comarca Avilés, Principality of Asturias (Asturias) Spain (2018)
Specimen size: 14.6 × 10.6 × 7.1 cm cm = 5.75” × 4.17” × 2.80”
Price: €480 / US$511 / ¥78310 / AUD$780

MR58AC2: Calcite with Boulangerite inclusions

Floater growth of very flattened Calcite rhombohedra with a single axis, so one can clearly see two zones, one of them snowy white and one darker due to inclusions of Boulangerite. One of the most characteristic curiosities of the Maramures mining area, currently just a memory.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures Romania (10/2003)
Specimen size: 2.6 × 2.3 × 1.9 cm = 1.02” × 0.91” × 0.75”
Price: [SOLD]

MA8AC2: Calcite with Boulangerite inclusions

Floater growth of much flattened Calcite rhombohedra with a single axis, so one can clearly see two zones, one of them clear with a hint of reddish Hematite and one darker due to inclusions of Boulangerite. One of the most characteristic curiosities of the Maramures mining area, currently just a memory.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures Romania (10/2003)
Specimen size: 2.5 × 2.5 × 1.8 cm = 0.98” × 0.98” × 0.71”
Price: [SOLD]

MP58AC2: Calcite with Boulangerite inclusions

Floater growth of very flattened Calcite rhombohedra with a single axis, so one can clearly see two zones, one of them snowy white and one darker due to inclusions of Boulangerite. One of the most characteristic curiosities of the Maramures mining area, currently just a memory.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures Romania (10/2003)
Specimen size: 3.2 × 2.7 × 2.7 cm = 1.26” × 1.06” × 1.06”
Price: [SOLD]

TC280EA: Calcite with Boulangerite inclusions

Floater spheroidal group with rosette growths of very flattened rhombohedral Calcite crystals with a black color due to the inclusions of fibrous Boulangerite crystals. A typical curiosity of the Maramures mining district, an area that is now only a memory.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures Romania
Specimen size: 11 × 9.4 × 8.9 cm = 4.33” × 3.70” × 3.50”
Price: [SOLD]

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