Greywacke definition

(geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.
noun
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Alternative Forms

Alternative Form of greywacke - graywacke

Other Word Forms

Noun

Singular:
greywacke
Plural:
greywackes

Origin of greywacke

  • Anglicised form of grauwacke.

    From Wiktionary