Minas Gerais, Brazil
Quartz may not be the most common mineral, but it might as well be. In spite of its apparent ubiquity, really nice, well-formed examples with super transparency are actually kind of scarce. Virtually all Quartz crystals on the market suffer from transparency and luster issues. Extraordinarily brilliant luster is only found at a few of the world's many, many localities. Herkimer, New York, is one example; the McEarl Mine in Arkansas is another, along with several places in Brazil, where this diamond-bright group hails from. Unlike colorless McEarl or Herkimer examples, the slightly smoky tint seen here is an immediate tipoff that the specimen is from "somewhere else" - like Brazil. The overall form of the piece is reminiscent of some "Gwindel" type groups also seen from Brazil, since there is a slight twist to the group when viewed from one direction. There are what appear to be a few white bladed inclusions, probably Cleavelandite, included into one face of a crystal - further indication of a Brazilian pegmatitic origin. Consistent with such an origin is the very even, light smoky tint due to K-Ar irradiation from Feldspars in the surrounding host granites. The faces of the crystals vary from simple, flat planes to ones with complex growth features, striations and etch-pits. There are signs of where it was originally attached to a fissure wall on one end, but no other signs of contact. A few "veil" type inclusions can be seen floating in the limpid interior of the group, but the overall transparency is extraordinary. Typical tiny nicks to a few edges but overall condition is excellent to pristine. Accompanied by a custom base.
Overall measurements: 7 x 5 x 3 inches (17.8 x 12.7 x 7.6 cm). Offered at no reserve.
Provenance: Ex. Keith Proctor Collection [Hoppel Catalog # D1961]
[Scale: 1 inch, with mark at 1 cm]
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