n. [ G. grauwacke; grau gray + wacke wacke. See Gray, and Wacke, and cf. Grauwacke. ] (Geol.) A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together. [ 1913 Webster ]
☞ This term, derived from the grauwacke of German miners, was formerly applied in geology to different grits and slates of the Silurian series; but it is now seldom used. [ 1913 Webster ]
{ } n. [ G. wacke, MHG. wacke a large stone, OHG. waggo a pebble. ] (Geol.) A soft, earthy, dark-colored rock or clay derived from the alteration of basalt. [ 1913 Webster ]
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