greywacke

English

Alternative forms

Etymology

Anglicised form of grauwacke.

Pronunciation

  • (UK) IPA(key): /ˈɡɹeɪ.wak.ə/
  • Audio (Southern England):(file)
  • (GS) IPA(key): /ˈɡɹeɪ.wæk/

Noun

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, published 2011, page 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.

Derived terms

Translations

This article is issued from Wiktionary. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.