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Glass Butte & Little Glass Butte | Obsidian Collecting Area - Oregon Discovery
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Obsidian, a form of black volcanic glass - Stock Image - C024/1088 - Science Photo Library
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Obsidian - Igneous Rocks
Natural Green Obsidian
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Obsidian: Mineral information, data and localities.
Obsidian – Black Glass Sharper than Diamond – my Science Blast
Obsidian: Volcanic Glass
