Corundum
Bozeman Corundum Co. Mine, Gallatin Gateway, Gallatin County, Montana, USA
5.8 x 5.4 x 3.5 cm. A 3.0 cm, pristine, sharp, tapered, hexagonal, blue-gray corundum crystal is set in a starkly contrasting feldspar aureole atop a sculptural matrix of biotite schist on this exceptionally aesthetic and uncommon example from this extinct corundum mine. Ex Kay Robertson Collection # 7913. Kay is a prominent California collector, ...
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