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Mineral Specimens with Calcite
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3.0 x 2.1 x 1.4 cm. Gemmy and lustrous, emerald-green dioptase crystals to 1.2 cm on contrasting calcite matrix.
Thumbnail. A complete all-around and colorless calcite rhomb. Ex. Rob Smith Collection.
10.5 x 6.7 x 6.0 cm. A large plate from the famous Picher, Oklahoma Field of the Tri-State District. Three, large, to 4.5 cm, hydrozincite-coated gemmy, amber calcite scalenohedrons dramatically project upward, like snow-wreathed mountains from a flat plain of silicified limestone, which is very attractively complimented with smaller coated calcite crystals and gemmy, ruby-jack sphalerite crystals. Ex. George Feist Collection, #2993.
5.8 x 5.3 x 3.6 cm. A fine calcite "pineapple" from the famous iron mines of Egremont, England. The very glassy, colorless calcite scalenohedrons, to 2.2 cm, are preferentially coated with rust-red hematite. Ex. Joseph Rawlings and Seaman Museum Collections.
6.3 x 4.8 x 4 cm. The upper portion of the specimen is a 4.2 cm open Calcite pocket interlaced with beautiful thick Silver ropes. These wires are several mm thick, up to 2 cm long as they curve, and have a gorgeous patina. For accent, there are even gemmy Calcites growing on the wires. Ex. Chicago Field Museum and Dan Ehrling collections.
11.2 x 6.1 x 5 cm. This specimen features a very fine, attractive complex 2.3 cm acanthite crystal nestled in a wide Calcite pocket, with associated sulfides and smaller acanthites.
8.3 x 5.9 x 5.9 cm. A translucent, yellow-tan scalenohedron of calcite, complete all around and terminated, that has wrapped around an earlier generation of crystal growth that was coated with microcrystalline calcite, so that it appears almost like a phantom.
7.3 x 5.3 x 5.3 cm. This specimen features a 5.5-cm calcite crystal canted at an angle, with little balls of hematite and crystals of chalcopyrite both on its surface and included just inside the surface of the crystal. The two minerals are sprinkled on the milky calcite matrix as well.
7.9 x 6.5 x 4.5 cm. From the collection of Richard Kosnar, a crystal of deep red cinnabar with an unusually elongated form of which you can see more than 2 centimeters emerging from the calcite crystals that surround it! Nearby in side the pocket is a cluster of sharp quartz crystals.
2.7 x 1.8 x 1.1 cm. The crystal is astoundingly glassy and water-clear exhibiting compressed, striated scalenohedral form sitting on another generation of brown Calcite crystals.
2.9 x 2.3 x 1.8 cm. A very attractive “flower”-shaped aggregate of Calcite consisting of highly compressed white rhombohedra.
2.6 x 2.1 x 1.8 cm. A classic Calcite thumbnail specimen from about 25 years ago. It features an intergrown pair of very light pink color textbook rhombohedra of Calcite associated with a small amount of accenting golden Pyrite.
10.0 x 7.9 x 7.8 cm. A very rare cluster of bright orange Wakabayashilite on a cabinet specimen of contrasting massive calcite. Ex. Andrew Carnegie Collection.
8.9 x 5.9 x 5.4 cm. An aesthetic example of a Sweetwater calcite, not just because the crystal is suffused with golden-yellow color, but more importantly, it is nestled in a bed of contrasting opaque galena crystals. The calcite itself measures 6 cm top to bottom. Ex. Feist Collection.
8.4 x 5.4 x 4.4 cm. A fine calcite, complete all around, lustrous, finely-terminated with a pyramidal tip, and good deep golden color. Ex. Feist Collection.
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Rob Lavinsky, rob@irocks.com
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