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collection of various tumbled and raw obsidian (volcanic glass) mineral stones isolated on white..., Stock Photo, Picture And Low Budget Royalty Free Image. Pic. ESY-052065773 | agefotostock
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Volcanic glass | geology | Britannica
Obsidian | Rock, Color, Composition, & Uses | Britannica
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14. Obsidian is volcanic glass formed when silica-rich lavas are cooled... | Download Scientific Diagram
Obsidian : How to Identify Obsidian? | Geology Page
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Obsidian Meaning Properties Facts and Photos
Obsidian: Igneous Rock - Pictures, Uses, Properties
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