pitchstone

(pic̸h′stōn′)

noun

a volcanic glass that somewhat resembles pitch and has a higher percentage of water than obsidian or other glassy rocks

Origin: calque of Ger pechstein < pech (< L pix), pitch + stein, stone

See pitchstone in American Heritage Dictionary 4

noun

Any of various volcanic glasses distinguished by their dull pitchlike luster.

Origin:

Origin: Translation of German Pechstein

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