gray|wacke «GRAY WAK, -WAK uh», noun.
Geology. a conglomerate of rounded pebbles and sand, derived chiefly from basic igneous rocks.
[< German Grauwacke < grau gray + Wacke kind of rock; (originally) gravel]

Useful english dictionary. 2012.

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  • wacke — gray·wacke; wacke; …   English syllables

  • gray — gray; gray·ish; gray·ling; gray·ness; gray·son; gray·wacke; gray·ly; ti·gray; …   English syllables

  • graywacke — gray·wacke …   English syllables

  • Graywacke — Gray wacke , 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] Note: This term, derived… …   The Collaborative International Dictionary of English

  • graywacke — /gray wak , wak euh/, n. Geol. a dark gray coarse grained wacke. Also, greywacke. [1805 15; partly trans., partly adapted from G Grauwache; see WACKE] * * * or dirty sandstone Sedimentary rock composed of sand sized grains in a fine grained clay… …   Universalium

  • sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

  • graywacke — n. (Geology) coarse grained wacke of dark gray color …   English contemporary dictionary

  • graywackes — n. (Geology) coarse grained wacke of dark gray color …   English contemporary dictionary

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