graywacke

(grāwak′)

noun

  1. a nonporous, dark-colored sandstone containing angular particles of other rocks
  2. a fine-grained conglomerate resembling sandstone

Origin: partial transl. of Ger grauwacke: see gray &

See graywacke in American Heritage Dictionary 4

noun
Any of various dark gray sandstones that contain shale.

Origin:

Origin: Partial translation of German Grauwacke

Origin: : grau, gray

Origin: + Wacke, rock (from Middle High German, from Old High German waggo, boulder; see wegh- in Indo-European roots)

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