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Mineral Specimens with Calcite
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This remarkable oldtimer came from the Maynard Bixby collection, turn of 1900s, to Chicago Field Musuem. (see the purchase note on the museum's accession card!). They essentially liquidated their musuem collection to Dave Crawford in the late 1980s, and he sold it to Ed, so we have the whole trail from 1905 til now, of ownership. it was probably found when Utah wasnt even a state. its the largest i have seen, best i have seen, and only good one i have seen for sale beyond a small specimen. Truth be told, I am thinking of trimming in half to keep one half as profit and i bet the other half would still probably go for the same 5000. These just are NOT around to be had, it is big, and it is pretty after all.. 17 x 12 x 5 cm
Charlesite cores surrounded by sturmanite (they are a series, and portions of the crystal are of different species, thus). These crystals are unusually well-formed to be so rich in charlesite, of which they mostly are composed. Charlesite is more white or very pale yellowish white, while the sturmanite is darker in hue. 4.4 x 2.9 x 1.7 cm
5.2 x 4.8 x 4.5 cm. After a hiatus, Irai is again producing unique and pretty calcite specimens, in all sorts of forms. Here is a particularly pretty one, with translucent cream-colored crystals on matrix. One of the crystals is sheared off cleanly at the edge of the matrix where the specimen was removed.
5.6 x 4.3 x 3.6 cm. A showy and excellent Tsumeb specimen of lustrous and glassy, colorless to brown, calcite rhombs aesthetically accented with arborescent, green mottramite. The calcite-lined vug is essentially pristine, with the periphery damage not detracting, as you can see.
7.1 x 4.4 x 4.2 cm. A beautifully-trimmed and balanced Eastern European calcite specimen, with two snowy calcite crystals with sharp faces centered on a matrix of translucent quartz crystals; the Rhodope Mountains have been producing wonderful calcites on and off for years now, in a great variety of forms and combinations with other minerals.
13.4 x 11.4 x 3.8 cm. An uncommon CABINET plate of bright, velvety, acicular aurichalcite on a matrix of limonite, with wonderful sea-foam green color. In one area are some small translucent calcite rhombs included with aurichalcite, so that they have picked up its color. A very rich and pretty Mapimi specimen! This is old material, seldom seen, and a very rich and large example at that.
6.8 x 4.7 x 3.3 cm. One of the most desirable varietals worldwide for calcite is these bright pink ones from Morocco, and the past year has seen some of the finest batches ever. This specimen has BIG crystals (to 0.8 cm) with bright pink color.
15.4 x 14.4 x 7.2 cm. Green fluorite covered with scalenohedral crystals of calcite that have been pseudomorphed by microcrystalline quartz. We photographed it with a light behind it so that you can see that this thick piece is nearly solid fluorite, mixed with some veins of quartz.
12.5 x 9.9 x 6.7 cm. Wow, a beautiful and large old Colorado classic, VERY hard to obtain these days, from the old Idarado locality in the San Juan Mountains! This is a flowery spray of large, light pastel-pink calcite crystals (the pink is from the manganese content). The crystals measure up to 9 cm from top to bottom! They are actually translucent if you put light behind them.
17.9 x 13.9 x 7.1 cm. Irai has on and off turned out gorgeous calcites in a dizzying array of forms. This is a classic crystal form for the locality, here represented in a profusion of crystals on a large plate of the typical copper-rich greenish matrix.
2.5 x 2.3 x 2.0 cm. An aesthetic and superb thumbnail of lustrous, jet-black, tetragonal hausmannite crystals on a pastel-red crust coated with tiny andradite garnets and nicely accented in the front with a water-clear, gem calcite rhomb. Beautiful material from the Carl Davis TN Collection.
4.2 x 4.0 x 2.0 cm. Splendent and sharp, black sphalerite crystals with ruby jack highlights aesthetically set on dolomite rhomb-covered matrix and BEAUTIFULLY accompanied by a 1.3 cm, glassy, doubly terminated and twinned calcite crystal from the famous and now-closed Elmwood Mine.
15.4 x 12.7 x 6.9 cm. A large cabinet specimen combining 3 classic Denton Mine minerals: a large, complete, euhedral calcite crystal; cubes of galena; and deep red, lustrous sphalerite crystals! Ex Ed David specimen. This remarkable combo is from a famous 1987 pocket called the Butterknife Pod and is well documented.
7.4 x 4.1 x 3.4 cm. Another Tsumeb piece - five absolutely GEMMY rhombs of calcite - in fact so gemmy they resemble water-clear Dalnegorsk fluorites except with rhombohedral form instead of cubes - ranged along a horizontal matrix. They measure to 1.5 cm.
5.8 x 3.8 x 3.2 cm. A MOST UNUSUAL and SHOWY box work of elongated, lustrous, brown calcite rhombs preferentially coated with drusy quartz and capped by a couple of small apophyllite crystals from Jalgaon, India. This visual piece is a complete, undamaged floater!
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Rob Lavinsky, rob@irocks.com
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share specimen![Conichalcite, Calcite from Mammoth Mine (Mammoth shaft), Tintic District, East Tintic Mts, Juab Co., Utah, USA [db_pics/mdpics/MD-104099a.jpg]](db_pics/mdpics/MD-104099a.jpg)
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