Category:Aphyritic rhyolitic obsidian

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Aphyritic rhyolitic obsidian at Obsidian Cliff (1 C, 20 F)

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Aphyric rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 4 (32933836788).jpg 4,000 × 3,000; 5.71 MB

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