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volcanic glass

noun
1.
a natural glass produced when molten lava cools very rapidly; obsidian.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for volcanic-glass

volcanic glass

noun
1.
any of several glassy volcanic igneous rocks, such as obsidian and pitchstone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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volcanic-glass in Science
volcanic glass  
Natural glass produced by the cooling of molten lava too quickly to permit crystallization. Obsidian is a type of volcanic glass.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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