|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Brazil > Corundum
|Cajazieras, Paraíba, Brazil
|Doubly-terminated di-pyramidal blue-gray corundum crystal with complex parallel crystallization patterns on the faces. The termination at one end of the corundum crystal has an unusual wedge-shaped raised segment, probably due to internal twinning. Weight: 106.2 grams. Ex. Earle Sullivan (author of History and Minerals of Old Mine Park, Trumbull, Ct.)
|For reference only
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