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Geological Links |
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Welcome to the Michigan Technological University Volcanoes Page |
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Email: tgs@tarleton.edu |
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M190 - Apache tears in a perlite matrix. Natural obsidian (volcanic glass) nodule embeded in perlite. Specimens are 3" to 4" dia. From Superior, Arizona. |
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Folded aplite dike in Cretaceous augen gneiss, Koolen gneiss dome, Chukotka Peninsula, NE Russia. |
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Persian Gulf and Gulf of Oman |
