Gesteinsglas

Definitions of Gesteinsglas
  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
    Pechstein
    dark acid granitic glass
    type of:
    Andesit/Basalt
    extrusive igneous rock solidified near or on the surface of the Earth
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