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Black Obsidian Rough • 652 grams (1.4 lb) ~ 147x95x43mm • 90100oBB-652-0 | SmokyMountainBeads.com

Obsidian is an igneous rock, a mix of cryptocrystalline grains of silica minerals in a glass-like suspension. It is a natural occurrence of volcanic glass created when lava from a volcano cools rapidly with minimal crystal growth.