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Cougar point tuff
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Devitrification
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Eifel District
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El Salto
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Field geology
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Galapagos
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Germany
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Goose Creek
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Idaho
Igneous rocks
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Isabela Island
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Kempenich
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Lapilli tuff
Lithophysae
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Mexico
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Moeraki Point
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New Zealand
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North Island
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Obsidian
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Obsidian Cliff
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Palagonite
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SW Greenland
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Spherulites
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Volcan Ecuador
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Volcanic rocks
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Volcanology
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Yellowstone National Park
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llimaussaq intrusion
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