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Mineral Specimens with Calcite
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11.4 x 6.9 x 4.8 cm. An extremely striking, large Indian specimen featuring a pristine crystal of calcite, transparent, with a silky luster, centered on a field of light pinkish stilbite. The flawless calcite crystal measures 4 cm across. Ex. Feist Collection.
5.4 x 2.8 x 2.4 cm. This fascinating specimen formed when gemmy calcite crystals grew in the natural pocket formed by a buried fossil clamshell. The interior of the shell is now completely covered with these fine, golden crystals. Not many fine collector specimens come from Florida.
12.0 x 6.4 x 6.4 cm. A large scalenohedral crystal of calcite, old material from the Tri-State District locality of Picher. Ex. A. L. Kidwell Collection. It has a smooth, naturally-pitted surface, and light amber color. Two clean cleaves on bottom to remove from matrix, no damage (and a perfect termination).
20.2 x 11.1 x 5.8 cm. A very large, intricate mass of stalactitic "fingers" of calcite from San Luis Potosi. These long, slender stalactites are encrusted with translucent, tan-colored crystals. Ex. Dave Stoudt Collection.
8.3 x 7.6 x 5.2 cm. A cluster of quartz crystals encrusted with small rosettes of calcite given their reddish-brown color from rich inclusions of hematite. Ex. Consie Prince Collection.
A GORGEOUS and unusually LARGE example of this classic material from the Kelly! The piece is bright and glistening (now that it is properly cleaned!), all around, and with only trivial damage. It is nearly pristine, in fact. One side is rich with calcite, strating white at the top and grading to bluish on the center and edges where more hevily included. The reverse side shows rich aurichalcite aplenty, with scattered calcite crystals in crevasses that tend to be more richly included than those on the front side. A very rare find, in this quality and size range! 13 x 8 x 6 cm
An impressive Heart Twin is one of the Holy Grails of any collection of calcites or of English minerals. These classic, twinned calcites were mined in the mid-to-late 1800's and remain one of the most infamous of all English mineral finds to this day. Few are as large or as thick (7 cm at the top!) as this one. This piece has size, lustre, and clarity going for it, though it is not pristine - there are a few dings and bruises, not invisible though not too distracting either, and this admittedly lowers the value. 11 x 8 x 7 cm
12.7 x 12.5 x 10.5 cm. This is a large, grapefruit-sized rosette of salmon-pink crystals of stilbite from the classic Deccan trap locality in India. It is really much more 3-dimensional and larger than usual. Ed liked his Indian minerals to have significance beyond the common, and for its size, this qualifies. However, it also has a nice accent of little yellow calcite crystals and, something more rare - attached matrix in back. Most of these pop off or form as floaters on apophyllite, while this has real matrix behind it (forming a nice display base). Ex. Ed David Collection.
9.9 x 9.9 x 6.9 cm. This is a very uncommon specimen of very large Austrian calcites - actually a sceptered, compound crystal with intricate stepping beneath the large double "cap". Ex. Wein Collection.
5.5 x 4.4 x 3.4 cm. A rich pocket of the most prized calcite varietal, the lovely pastel-pink cobalt-rich variety. These are glossy, wonderfully transparent crystals.
7.6 x 6.2 x 3.2 cm. These Thomasville calcites have such a unique and pretty look to them when they are at their best, as with these: like little jewels just dropped on the matrix. These have superb luster and clarity (their transparency is much more evident in person), and they are arranged in a pretty balance on the matrix. They measure to 1.8 cm. Ex. Feist Collection.
10.7 x 7.5 x 5.5 cm. A very rare and unique combination specimen from the Viburnum Trend District. This showy, old-time specimen features glassy, jet-black bitumen (a "solid oil" or hydrocarbon material) scattered amongst a rich covering of lustrous, metallic-gray galena cubes and sphalerite crystals on a vuggy, two-sided matrix of silicified limestone coating with tiny, contrasting, colorless calcite rhombs. The back even features a couple of quartz needles, as a highlight. Ex. George Feist Collection.
3.2 x 2.4 x 2.0 cm. Gorgeous, super sparkly, vivid pink, manganese-rich calcite in a fine, bubbly, bifurcated, brain-like form. This is a beautiful, pristine, complete all-around specimen is an intense cluster of flattened rhombs. The scattered, light material is an overgrowth of secondary calcite or quartz, not damage. This very showy and rare calcite varietal specimen is from the Wessels Mine and the Rob Smith Collection.
7.5 x 5.2 x 3.3 cm. Spectacular, gem-like calcite scalenohedrons richly and aesthetically cover a bit of matrix on this beautiful calcite specimen from a very less well-known Mexican locality - the Hercules Mine in Chihuahua. The striking, large, 5.4 cm crystal on the left side is doubly terminated and twinned. Ex. Dave Stoudt Collection.
5.1 x 4.0 x 2.7 cm. A large crystal of yellow fluorine-rich ellestadite to 1.5 cm, trapped in beautiful blue calcite. These are common enough as microcrystalline material from this locality, but few crystals of such size (and in good condition) are found. Quite exceptional for the species. NOTE: Texas Industries is the current owner of Riverside Cement and the cement plant there has been shut down since a week before Christmas 2008.
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Rob Lavinsky, rob@irocks.com
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share specimen![Calcite, Stilbite-Ca from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-213186a.jpg]](db_pics/mdpics/MD-213186a.jpg)
![Calcite from Rucks Pit, Fort Drum, Okeechobee Co., Florida, USA [db_pics/mdpics/MD-213200a.jpg]](db_pics/mdpics/MD-213200a.jpg)
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![Calcite (Var: Cobaltoan Calcite) from Bou Azzer, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco [db_pics/mdpics/MD-214692b.jpg]](db_pics/mdpics/MD-214692b.jpg)
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![Calcite (Var: Manganoan Calcite) from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-214895a.jpg]](db_pics/mdpics/MD-214895a.jpg)
![Calcite from Hercules Mine (Negra Mine), La Negra, Mun. de Carmargo, Chihuahua, Mexico [db_pics/mdpics/MD-214898a.jpg]](db_pics/mdpics/MD-214898a.jpg)
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