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Mineral Specimens with Calcite
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A cluster of gemmy radiating calcites is perched atop a cluster of teal-blue to purple fluorites. There is a clean cleave on the front of the large fluorite that serves as a base for the specimen, and a bit of damage to the top, smaller fluorites, but with this specimen, the attractiveness is really in how the calcites and fluorites complement one another. 5.5 x 4 x 2.7 cm
7.8 x 6.9 x 4.4 cm. A cluster of super-complex, micro-stepped crystals of sphalerite, intricately intergrown with galena in some places such that it is hard to make out which is which. A "snowfall" of tan calcite microcrystals dresses up the specimen nicely. Ex. Dave Stoudt collection.
6.9 x 6.4 x 2.9 cm. An old Tri-State calcite from Treece, featuring a light amber crystal measuring 4 cm, with an extension crystal growing right out of the tip of its termination. The calcite has fine luster, and is complete and undamaged all around. Probably collected prior to the 1960s, from the Feist collection.
10.4 x 9.9 x 5.9 cm. Here are several mounds of thickly piled-up rhombic compound crystals of calcite. The calcites are transparent, in super condition, with some of the crystals having natural corner bevels. Unusual calcite for this locale. Ex. Feist Collection.
9.9 x 9.9 x 6.9 cm. From the Feist Collection, which was rich with Tri-State calcite specimens collected prior to the 1960s – a fine cluster of translucent, golden/amber crystals. The largest one measures just under 8 cm, and is doubly-terminated, with both terminations standing out off the matrix.
6.5 x 5.1 x 2.9 cm. These are rounded bursts of tan-colored calcite crystals on a contrasting grayish matrix, from the Rensselaer Quarry, Indiana. Ex. Feist Collection.
12.9 x 7.4 x 4.9 cm. A large and superb York County calcite, out of the Feist Collection. Surface inclusions of iron impurities giving the calcites from this mine this dazzling orange color. This is a single very large crystal with micro-stepping all over its faces. It is complete all around and uncontacted, and absolutely glows under good light.
9.9 x 7.9 x 4.4 cm. This perfect calcite twin is from a find around 7 years ago that produced specimens with calcites in several different forms, often on the same specimen (as in this case) - all with the same beautiful and distinctive "silky" luster. If you look closely you can actually find several twins on this specimen, but the main one measures 2.5 cm. Ex. Dave Stoudt collection.
7.8 x 4.4 x 3.5 cm. This fine Sweetwater Mine calcite crystal is complete all around, with a fine gleam to it, and with glowing golden color and a gemmy tip. The pyramidal termination is pristine. Minor associated micro-dolomites and chalcopyrites. Ex. Feist Collection.
8.9 x 7.8 x 6.4 cm. Here is an old-timer collected in the 1940s, featuring a couple of golden, transparent scalenohedral crystals set amongst colorless ones - on a chert matrix. The large, light golden crystal at the top measures 4.5 cm. Ex. Feist Collection.
11.3 x 5.6 x 4.3 cm. A superb cabinet calcite scalenohedron from the Sweetwater Mine of Missouri’s Viburnum Trend. The pristine, excellent crystal has a striking interior phantom that is dusted with marcasite microcrystals. The phantom is light gray, grading upward at the tip to a stunning, gemmy, golden amber. Ex. Dr. Gary Hansen Collection, which dates the piece to the 1970s or early 1980s.
4.4 x 3.8 x 2.2 cm. The borate deposits of California have produced some really beautiful/unusual mineral specimens. Few are as unusual as ulexite, also called "TV rock" for its fiber-optic-like optical properties. This particular matrix specimen is features a radiating spray of discrete ulexite needles, something you almost never see in the mineral. The needles have superb lustre and a pearlescent, white to tan color. The ulexite needles are in association with some tan, translucent calcite crystals in rounded masses. Ex. Jim Minette Collection.
7.5 x 6.6 x 5.0 cm. An unusual and fine cluster of V-shaped stalactitic-growth calcite columns from the famous Villabona District of Asturias, Spain. The highly lustrous, stepped-growth calcite stalactites are capped with gemmy and blocky, colorless calcite rhombs.
4.6 x 3.8 x 2.9 cm. A beautiful, gemmy and lustrous, 1.5 cm, emerald crystal with excellent color set in a calcite-lined vug on sculptural shale matrix from the famed Coscuez Mine of Colombia. The two, smaller emeralds are a very nice accent.
7.1 x 4.4 x 2.3 cm. A classic, old-time (mid to late 1800s, probably) and aesthetic English specimen. A 7.1 cm, lustrous, doubly terminated calcite scalenohedron is attached to a matrix of sparkly, clay-included calcite rhombs. The center of the calcite crystal is clay-included, while the very complexly terminated tips are beautifully gemmy and glassy.
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Rob Lavinsky, rob@irocks.com
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share specimen![Calcite from Denton mine, Goose Creek Mine Group, Harris Creek Sub-District, Illinois - Kentucky Fluorspar District, Hardin Co., Illinois, USA [db_pics/mdpics/MD-19908a.jpg]](db_pics/mdpics/MD-19908a.jpg)
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