greywacke

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English[edit]

English Wikipedia has an article on:
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Alternative forms[edit]

Etymology[edit]

Anglicised form of grauwacke.

Pronunciation[edit]

Noun[edit]

greywacke (countable and uncountable, plural greywackes)

  1. (geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.
    • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 177:
      Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.

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