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Volcanic Glass

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cpfc | 18:36 Wed 09th Jun 2010 | Quizzes & Puzzles
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hi all hope someone can help

what name is commonly given to the dark volcanic glass formed by quickly cooling lava?

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obsidian ?
18:38 Wed 09th Jun 2010
obsidian ?
Possibly obsidian, but there are a lot of types depending on the final structure of the cooled glass
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thank you both

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