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pitchstone

[pich-stohn] /ˈpɪtʃˌstoʊn/
noun
1.
a glassy volcanic rock having a resinous luster and resembling hardened pitch.
Origin
1775-1785
1775-85; translation of German Pechstein. See pitch2, stone
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pitch-stone

pitchstone

/ˈpɪtʃˌstəʊn/
noun
1.
a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc
Word Origin
C18: translation of German Pechstein
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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Encyclopedia Article for pitch-stone

pitchstone

a volcanic glass with a conchoidal fracture (like glass), a resinous lustre, and a variable composition. Its colour may be mottled, streaked, or uniform brown, red, green, gray, or black. It is formed by the rapid cooling of viscous lava or magma.

Learn more about pitchstone with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Word Value for pitch

12
13
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