pitchstone definition

  • noun:
    • any one of different volcanic eyeglasses distinguished by their particular dull pitchlike luster.
    • a normal glass, this is certainly high in microscopic crystallites, formed by the rapid air conditioning of lava or magma
    • An igneous stone of semiglassy nature, having a luster like pitch.
    • a vintage volcanic stone, resembling hardened pitch in features.
    • dark acid granitic glass

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