n. (US graywacke) Geol. a dark and coarse-grained sandstone, usu. with an admixture of clay.
Etymology: Anglicized f. G Grauwacke f. grau grey: see WACKE

Useful english dictionary. 2012.

Look at other dictionaries:

  • Greywacke — (German grauwacke , signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted, angular grains of quartz, feldspar, and small rock fragments set in a compact, clay fine matrix …   Wikipedia

  • greywacke — /gray wak , wak euh/, n. graywacke. * * * …   Universalium

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

  • greywacke — [ greɪwakə] (US graywacke) noun Geology a dark coarse grained sandstone containing more than 15 per cent clay. Origin C18 (as grauwacke): from Ger. Grauwacke, from grau grey + wacke …   English new terms dictionary

  • greywacke — /ˈgreɪwækə/ (say graywakuh) noun a dark coloured sandstone or grit, containing fragments of various rocks, such as slate or schist. {half translation, half adoption of German Grauwache. See wacke} …   Australian English dictionary

  • greywacke —   n. coarse grained sandstone …   Dictionary of difficult words

  • greywacke-slate — greywacke slateˈ noun A fine grained fissile greywacke • • • Main Entry: ↑greywacke …   Useful english dictionary

  • Greywacke zone — The greywacke zone is a band of Paleozoic sedimentary rocks in the Austrian Alps. The zone is part of the Austroalpine nappes.Mesozoic limestones crop out north of the greywacke zone, forming the Northern Calcareous Alps. South of the zone… …   Wikipedia

  • Torlesse Greywacke — is a type of sedimentary rock. It is a hard and rather drab grey sandstone that is predominantly found in New Zealand though it is found elsewhere in the world as well. LocationTorlesse Greywacke is found east of the Alpine Fault in the Southern… …   Wikipedia

  • Omana Regional Park — View from Omana towards Waiheke Island. View o …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.