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pitchstone

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pitch⋅stone

  [pich-stohn]
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–noun
a glassy volcanic rock having a resinous luster and resembling hardened pitch.
Origin:
1775–85; trans. of G Pechstein. See pitch 2 , stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pitch·stone   (pĭch'stōn')   
n.  Any of various volcanic glasses distinguished by their dull pitchlike luster.

[Translation of German Pechstein.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

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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