Last Updated：2025/11/21

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

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pitchstone

Source Word

pitchstone

uncountable usually

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

Japanese Meaning

溶岩またはマグマが急速に冷却されることによって形成され、微細な結晶が豊富に含まれる天然のガラス状岩石。

The coastal cliffs were studded with dark nodules of pitchstone, their glassy surfaces glinting in the sunlight.

海岸の崖には、溶岩が急冷してできた微小結晶を多く含む天然の火山ガラスの暗い塊が点在し、そのガラス質の表面が陽光にきらめいていた。

Sense（1）

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

pitchstones

（ plural ）