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Obsidian
Obsidian - Wikipedia
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:max_bytes(150000):strip_icc()/GettyImages-1046245794-39d22631f5184718b7f7dd6f040cd49d.jpg "The Many Variations of Obsidian Rock")
The Many Variations of Obsidian Rock
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Obsidian | Atlas of magmatic rocks
Obsidian | Rock, Color, Composition, & Uses | Britannica
