Corundum
Camp Creek Corundum Occurrence, Ruby Range, Beaverhead County, Montana, USA
9.0 x 8.1 x 3.3 cm. Mineral specimens from this extinct, obscure corundum mine (mined for abrasives) are rare, indeed. A 2.8 cm, doubly terminated, tapered, lavender crystal (sapphire?) dominates this showy and rich plate. The lustrous crystals exhibit typical layering. Smaller crystals and crystal sections are very richly scattered on all sides ...
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