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Mineral Specimens with Calcite
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19.4 x 12.4 x 4.8 cm. A BIG plate from a small and unusual find of glassy calcites, with a beautiful orangey tone from hematite inclusions. There are a couple of big crystals here that measure 5 cm across! But what makes this specimen so eye-catching is the superb luster and flash of the crystals.
9.5 x 8.4 x 7.9 cm. A pocket of wonderfully pink and transparent crystals of the prized cobaltoan variety of calcite, always highly desirable in crystals of good size and color. These crystals measure up to 0.8 cm.
12.2 x 7.9 x 4.1 cm. Italian sulfurs, the best in the world, are really hard to obtain now. This one has gemmy, bright yellow crystals to 0.8 cm, isolated on a matrix carpeted with micro-calcites. There are crystals on BOTH SIDES of this specimen, as it was apparently a ridge that was exposed on both sides in the pocket, and the calcite with sulfurs wraps all the way around the specimen. Ex. John Ydren Collection.
15.4 x 12.2 x 11.9 cm. This is an OLD, unusual, very large specimen from Hardin County that is very uncommon to see on the market. What you have is these large, very spiky calcite scalenohedra (some of them do have tip cleaves), with a coating of whitish benstonite. The calcites have grown on a layer of teal-colored fluorite. Two layers of this fluorite sandwich a layer of brownish-yellow calcite. An old-timer! Ex. collection of Gary Hansen, noted Mid-west dealer until 1980s.
3.0 x 2.8 x 1.8 cm. A superb, old-style pyrargyrite nicely isolated on contrasting, sparkly calcite matrix. This is a rare old habit and style! Ex. American Museum of Natural History. The crystal is 1.3 cm tall.
10.9 x 8.4 x 4.7 cm. Very unusual and pretty material from a little-known locality - these are frosty purple octahedra of fluorite (with micro-stepped Uncommon on the market, not the usual "by the ton" Chinese stuff!
7.3 x 4.6 x 2.1 cm. On a crust of sparkling pink dolomite is a plate of lustrous, pearlescent, ivory colored, intergrown crystals of calcite, with individuals reaching .7 cm across. There is even the hint of chatoyancy to the crystals. This variety is often shown to be zinc-rich, and labeled zincian calcite or zincian dolomite. Ex. Charlie Key.
5.6 x 4.7 x 3.6 cm. Sparking white rosettes of dolomite are the host for rhombs of lustrous and translucent, tan calcite with crystals reaching 2.0 cm across. Ex. Charlie Key.
9.5 x 6.4 x 2.7 cm. This is an unusual, double sided specimen. The top view is that of intergrown rhombs of sparkling, translucent, tannish-gray calcite, to 1.2 cm across. The back side is covered in rhombs of greenish -gray dolomite, to 1.7 cm across. HIGH lustre makes this better than most Tsumeb calcites in terms of display quality. Ex. Charlie Key.
4.8 x 3.1 x 1.3 cm. Brownish-red dolomite contrasts beautifully with clusters of rhombohedral calcite invested with apple green duftite. The clusters, which reach 1.0 cm across, are further enhanced by a light blue play of colors on the calcite crystals when the specimen is turned. Unusual and very attractive, if small, specimen. Ex. Charlie Key.
6.9 x 5.1 x 4.8 cm. Rusty limestone is host to a cluster of intergrown lustrous, ivory colored rhombs of calcite, to 3.0 cm across. Very unusual calcite style, perhaps lead-rich "plumbocalcite" though not analyzed. Ex. Charlie Key.
6.7 x 3.6 x 3.6 cm. This matrix specimen is covered by rhombs of lustrous and translucent, ivory colored calcite, to 1.5 cm across along with clusters of apple green duftite, some of which has been intermixed with rhombs of calcite. Ex. Charlie Key.
3.0 x 2.6 x 2.3 cm. Gemmy and glassy, emerald green crystals of dioptase, to .5 cm across are flanked by white, cauliflower-like growths of calcite. A lovely color combination! Ex. Charlie Key.
3.7 x 2.7 x 2.3 cm. This cluster of lustrous calcite crystals has been heavily included by hematite giving the whole specimen a bright red appearance. The crystals reach 2.0 cm across. Tsumeb classic! Ex. Charlie Key.
5.4 x 3.9 x 3.6 cm. A thin crust of iron stained dolomite is the host for a large cluster of intergrown lustrous and translucent, tan-colored calcite. In fact, this cluster which is 3.5 cm across, is almost a rolling wave of calcite, and is very dramatic and unusual. Looks like smithsonite on 1st glance. Ex. Charlie Key.
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Rob Lavinsky, rob@irocks.com
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share specimen![Calcite from Chenzhou Prefecture, Hunan Province, China [db_pics/mdpics/MD-154842a.jpg]](db_pics/mdpics/MD-154842a.jpg)
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![Calcite, Hematite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-155863a.jpg]](db_pics/mdpics/MD-155863a.jpg)
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