Pitchstone meaning

pĭchstōn
Any of various volcanic glasses distinguished by their dull pitchlike luster.
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A volcanic glass that somewhat resembles pitch and has a higher percentage of water than obsidian or other glassy rocks.
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(geology) A natural glass, rich in microscopic crystallites, formed by the rapid cooling of lava or magma.
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Origin of pitchstone

  • Translation of German Pechstein

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Wiktionary