Category:Aphyritic and partially devitrified rhyolitic obsidian

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Aphyritic and partially devitrified rhyolitic obsidian at Obsidian Cliff‎ (16 F)

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Aphyritc & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 7 (32933857228).jpg 2,749 × 2,546; 5.71 MB

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