tachylyte definition

  • noun:
    • A black, glassy basalt of volcanic source.
    • A black, vitreous basalt of volcanic source
    • A vitreous type of basalt; -- so-called because decomposable by acids and easily fusible.
    • A vitreous form of basalt; basalt-glass; a rock happening usually along the edges or selvages of dikes of basalt or other forms of fundamental lava, but sometimes creating flows of considerable magnitude, as at Kilauea.
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