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welded tuff

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ig⋅nim⋅brite

[ig-nim-brahyt]
–noun Petrology.
a fine-grained volcanic rock consisting mainly of welded shards of feldspar and quartz.
Also called welded tuff.


Origin:
1932; < L ign(is) fire + imbr-, s. of imber rain, shower + -ite 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
ignimbrite   (ĭg'nĭm-brīt')  Pronunciation Key 
A volcanic rock formed by the consolidation of volcanic ash and other material ejected by an explosive volcanic eruption.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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