greywackeとは 意味・読み方・使い方

語源

Anglicised form of grauwacke.

発音

• (英国発音) IPA^(key): /ˈɡɹeɪ.wak.ə/
• (GS) IPA^(key): /ˈɡɹeɪ.wæk/

名詞

greywacke (countable かつ uncountable, 複数形 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.

派生語

• metagreywacke, metagraywacke