Definitions for volcanic glass
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Random House Webster's College Dictionary
volcan′ic glass′(n.)
a natural glass produced when molten lava cools very rapidly; obsidian.
Category: Geology
Origin of volcanic glass:
1830–40
Princeton's WordNet
volcanic glass(noun)
a kind of natural glass produced when molten lava cools very rapidly
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"volcanic glass." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/volcanic glass>.

