Gemmology
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Obsidian


A rock; a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension.

See:
Obsidian — specimen 0742
Obsidian — specimen 0742, photo © NMNHS

Material from ‘Repository’

5 specimens: 0742 — 1.20 ct, no locality data; 0735 — 2.86 ct, no precise locality [Africa]; 0617 — 32.97 ct, Mexico; 0734 — 1.91 ct, no locality data; 0738 — 1.99 ct, no locality data.


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