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Gritstone vs Greywacke - What's the difference?

gritstone | greywacke |

As nouns the difference between gritstone and greywacke

is that gritstone is a form of sedimentary rock, similar to sandstone but coarser while greywacke is (geology) a hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.

gritstone

English

Noun

  • A form of sedimentary rock, similar to sandstone but coarser.

    • See also

    *("gritstone" on Wikipedia)

    greywacke

    English

    (wikipedia greywacke)

    Alternative forms

    * graywacke

    Noun

  • (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.

    • Derived terms

    * metagreywacke, metagraywacke