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A rock; a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension.
Obsidian — specimen 0617
, photo © NMNHS
Material from ‘Repository’
— 32.97 ct, Mexico.
Gemmology — gemstones
National Museum of Natural History, Sofia
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None of the specimens illustrated in this site is on display in the permanent exhibition of the National Museum of Natural History, Sofia.