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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”
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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”

Main crystal size: 2.1 × 2 cm = 0.83” × 0.79”
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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”
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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”

Main crystal size: 2 × 1.4 cm = 0.79” × 0.55”
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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”
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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”

Main crystal size: 3.3 × 3.1 cm = 1.30” × 1.22”
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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”
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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”

Main crystal size: 5.3 × 3 cm = 2.09” × 1.18”
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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”
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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”

Main crystal size: 0.8 × 0.7 cm = 0.31” × 0.28”
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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”
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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”
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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”
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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”
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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”
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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”

Main crystal size: 2.8 × 2.3 cm = 1.10” × 0.91”
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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”
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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”

Main crystal size: 6.6 × 4.6 cm cm = 2.60” × 1.81”
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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”
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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”
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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”
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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”

Main crystal size: 4 × 1.8 cm = 1.57” × 0.71”
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TC560CT: Calcite with Boulangerite inclusions
Spheroidal rosettes of very flattened rhombohedral Calcite crystals, black in color due to the inclusions of fibrous Boulangerite crystals. A typical curiosity of the Maramures mining area, an area that is now only a memory.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures  Romania
Specimen size: 13.6 × 10.1 × 7.9 cm = 5.35” × 3.98” × 3.11”
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E82H: Calcite with Boulangerite inclusions
A lovely group of floater Calcite balls. Extremely original!
Herja Mine, Chiuzbaia, Baia Sprie, Maramures  Romania (04/2001)
Specimen size: 7 × 4 cm = 2.76” × 1.57”
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MH60J2: Calcite with Boulangerite inclusions
The crystals, which really are very flat rhombohedrons with extremely curved edges, are grouped in a floating rosette that seems divided in two parts due to black zoned inclusions of Boulangerite on one side.
Herja Mine, Chiuzbaia, Baia Sprie, Maramures  Romania (10/2003)
Specimen size: 3.7 × 3.5 × 2.5 cm = 1.46” × 1.38” × 0.98”

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