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Webster 1913 Edition

Pitchstone

Pitch′stoneˊ

,

Noun.

(Geol.)

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

Definition 2025

pitchstone

pitchstone

English

Noun

pitchstone ‎(usually uncountable, plural pitchstones)

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

Translations

natural glass

Chinese:
Mandarin: 松脂岩 (zh) ‎(sōngzhīyán)

Finnish: laavalasi
Japanese: 松脂岩 ‎(しょうしがん, shōshigan)

See also

pitchstone on Wikipedia.Wikipedia