|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Brazil > Corundum
|Cajazieras, Paraíba, Brazil
|Doubly-terminated di-pyramidal blue-gray corundum crystal fully crystallized on all faces. The termination at one end has an unusual wedge-shaped segment, probably due to internal twinning. Ex. Earle C. Sullivan (1906-2005), author of History and Minerals of Old Mine Park, Trumbull, Ct.
|For reference only
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