pitchstone

pitch·stone (pic̸h′stōn′)

noun

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

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

Modifies a noun

flake: At this point, the pitchstone flake should also be noted.

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