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volcanic glass

DEFINITIONS OF: volcanic glass

1

n a kind of natural glass produced when molten lava cools very rapidly

Types:
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
Type of:
volcanic rock
extrusive igneous rock solidified near or on the surface of the Earth
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