| / English Dictionary |
VOLCANIC GLASS
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A kind of natural glass produced when molten lava cools very rapidly
Classified under:
Hypernyms ("volcanic glass" is a kind of...):
volcanic rock (extrusive igneous rock solidified near or on the surface of the Earth)
Hyponyms (each of the following is a kind of "volcanic glass"):
obsidian (acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces)
pitchstone (dark acid granitic glass)
tachylite (a basic or basalt glass)
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