VOLCANIC GLASS

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

A kind of natural glass produced when molten lava cools very rapidly

Classified under:

Nouns denoting substances

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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