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Obsidian — specimens [gallery view]
A rock; a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension.
0742
no precise locality
0735
Africa
0760
Argentina
0761
Argentina
0617
Mexico
0734
no precise locality
0738
no precise locality
Obsidian — specimens — 7
Page 1
Gemmology — gemstones
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.