hyaloclastite

English

Etymology

From hyalo- +‎ clast +‎ -ite.

Noun

hyaloclastite (countable and uncountable, plural hyaloclastites)

  1. (geology) A type of volcanic rock containing glassy clasts, that is, fragments.
    • 2004, Richard Fortey, The Earth, Folio Society, published 2011, page 45:
      Explosive cooling and the sedimentation of glassy fragments results in a rock with a characteristic speckly texture known as hyaloclastite.
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