volcanic glass

Definitions of volcanic glass
  1. noun
    a kind of natural glass produced when molten lava cools very rapidly
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    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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