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Mineral Specimens with Quartz
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5.2 x 4.6 x 1.6 cm. A fine Peruvian specimen of an elongated 3 cm Tetrahedrite crystal completely covered by lustrous Pyrite crystals, all on a plate of Quartz. Ex. Charlie Key.
13.5 x 11.8 x 7.5 cm. A superb grouping of three terrific Fluorite cubes, the largest of which is 5 cm on edge, on a white Quartz matrix (itself on underlying massive Fluorite). The Fluorites are very translucent and have a delicate green color with just a hint of purple along the edges (and perhaps the cores). Very reminiscent of the excellent Fluorite find from the Blanchard Mine’s Portales Pit in 1995. Ex. Charlie Key.
6.5 x 4.7 x 4.4 cm. A beautiful 3 cm (internal dimension) pocket of lustrous deep blue Shattuckite sitting on Quartz. The velvety shattuckite pocket is preserved in its entirety, just perched there on quartz. Ex. Charlie Key.
5.0 x 3.4 x 2.4 cm, 4.0 x 2.8 x 2.6 cm, 3.2 x 1.2 x 1.1 cm (single crystal). From the collection of Charlie Key, here are 3 superb quartz miniatures. There is a clear, doubly-terminated quartz crystal slanting dramatically across matrix, leaning on a smaller crystal; a floater, doubly-terminated, deep purple amethyst crystal with gemmy tips; and, another matrix piece, with a large, clear quartz crystal accented by several smaller, purple-tipped, reverse-sceptre crystals.
5.4 x 3.9 x 1.8 cm. This is an old-time Mexican amethyst cluster from Guanajuato. This is a knob of crystals, complete all the way around, and sliced off flat on the bottom from the matrix. Accompanied by an old Burminco label - and this piece of very recent sad news: "Dec 6, 2008 ... George Burnham, founder and owner of the Burminco rock and mineral company, died Nov. 28 at the age of 94".
10.5 x 5.0 x 3.5 cm. A truly interesting, unusual, and sculptural quartz specimen from the Namibian side of the Orange River. Here, you have three glassy crystals growing across one another. Inclusions towards their bottoms have fuzzy light green chlorite inside a brownish exterior, and the clear quartz gives a window to these unusual inclusions. From a private collection in Namibia.
7.8 x 5.1 x 3.9 cm, 6.4 x 5.4 x 4.2 cm. Two specimens of rare "rose" muscovite from a recent find in a pegmatite mine in Taos County, New Mexico. Muscovite is familiar in various hues beyond the usual silver: particularly green, yellow, lavender, and even a reddish orange (Canada). But this is truly a rare color for the mineral - and, it is from a U.S. locality. Self collected by friends of ours in Dallas.
10.8 x 7.1 x 6.2 cm. The original, large scalenohedral crystals of calcite are now completely gone, etched away by corrosive solutions in the pocket, while the orangey covering quartz retains their sharp shape. If you flip this specimen over, or look through the missing tip of one of the pseudormorphs, you can see that the specimen is hollow inside. To make it even more interesting, a later generation of calcite crystals has formed on the outside of the quartz - so it is calcite, on quartz, on now-missing calcite. Ex. Richard Hauck Collection.
9.0 x 2.4 x 2.4 cm. A fine Black Rapids quartz specimen that came out of the Hauck Collection. Quartz crystals have been mined by Quartz Crystals Mines Limited at this location since 1943, both from open pit and underground workings, in a breccia zone in gneiss. Both of the crystals here are doubly-terminated and undamaged - this is a floater.
13.8 x 8.8 x 7.5 cm. This is a very geometric and just fascinating pseudomorph specimen from a find in the Atlas Mountains of Morocco, called a "box cast". What you have are these huge blocky crystals of fluorite that have been pseudomorphed by sparkly, light amethystine quartz. Across the top lies a poker-chip calcite crystal which has also been pseudomorphed in this way. The largest of the pseudomorphs measures 9 cm along the edge. Ex. Richard Hauck Collection.
17.5 x 15.0 x 9.4 cm. A very large, unique-looking, beautiful amethyst specimen from Uruguay, out of the Hauck Collection. This is essentially the side of a pocket, completely lined with amethyst-covered quartz stalactites. The crystals are very lustrous.
16.0 x 15.0 x 8.8 cm, 15.5 x 13.0 x 9.9 cm. This specimen is from the Hauck Collection. It is a huge, hollow sphere of coral - you can clearly see the pattern on the outside - that has been replaced or filled inside with botryoidal chalcedony - one of those unusual cases where biology meets mineralogy. The coral is flat on the bottom, where it was attached, and almost perfectly spherical on top, like a skull. Amongst the botryoidal forms of the chalcedony inside are stalactitic "fingers". Some of the chalcedony is white, and some of it is a translucent coffee color.
8.8 x 7.6 x 2.3 cm. A very rare Brazilian specimen, featuring a very large and complete tabular crystal of quartz, with a tourmaline crystal growing right on its edge. The quartz edges are complete all the way around - so this is not only a very unusually-formed quartz crystal, but the condition is superb; it is a floater with no matrix contacts, and no damage. Ex. Richard Hauck Collection.
10.4 x 8.4 x 7.0 cm. Sawn out of the hard rock matrix with a natural "base", here is a striking 7.5-cm stalactite of quartz covered with sparkly crystals. It is complete and un-contacted, with a natural "hook" at its tip. Sculptural and unusually good balance of size and drama for a quartz stalactite from India.
13.8 x 8.8 x 7.8 cm. A superb burst of slender, elegant, transparent crystals of quartz, peppered with lustrous, golden pyrites. The pyrite cubes have pretty striations on their faces. Ex. Richard Hauck Collection.
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Rob Lavinsky, rob@irocks.com
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