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Igneous Rock

Can you give a good description of obsidian?

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May 11, 2012 3:34PM

This is taken from the Wikipedia article:

"Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock."

Igneous means that the material obsidian is made of is molten initially. Extrusive means that the material pours or explodes out of volcanoes, as opposed to remaining under the earth's surface. See links for more.