PITCHSTONE

pitchstone

(noun) dark acid granitic glass

Source: WordNet® 3.1

Etymology

Noun

pitchstone (usually uncountable, plural pitchstones)

(geology) a natural glass, rich in microscopic crystallites, formed by the rapid cooling of lava or magma

Anagrams

• postethnic

Source: Wiktionary

Pitch"stone`, n. (Geol.)

Definition: An igneous rock of semiglassy nature, having a luster like pitch.

Source: Webster’s Unabridged Dictionary 1913 Edition

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