pitchstone
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Related to pitchstone: gabbro
pitch·stone
(pĭch′stōn′)n.
Any of various volcanic glasses distinguished by their dull pitchlike luster.
[Translation of German Pechstein.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
pitchstone
(ˈpɪtʃˌstəʊn)n
(Geological Science) a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc
[C18: translation of German Pechstein]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun | 1. | pitchstone - dark acid granitic glass volcanic glass - a kind of natural glass produced when molten lava cools very rapidly |
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