obsidian definition

  • noun:
    • A usually black or banded, hard volcanic cup that presents shiny, curved surfaces when fractured and is created by quick air conditioning of lava.
    • a type of black glass generated by volcanos
    • a type of cup generated by volcanoes. Most commonly it is of a black shade, and opaque, except in slim splinters.
    • A volcanic rock, in a vitreous condition, and closely resembling ordinary bottle-glass in features and surface.
    • acid or granitic glass formed because of the rapid air conditioning of lava without crystallization; generally dark, but transparent in slim pieces
  • adjective:
    • black colored

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