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.
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http://en.wikipedia.org/wiki/Glossary_of_geology
• (n.) A conglomerate or grit rock, consisting of rounded pebbles sand firmly united together.
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http://thinkexist.com/dictionary/meaning/graywacke/
<geology> A conglomerate or grit rock, consisting of rounded pebbles sand firmly united together. ... This term, derved 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. ... Origin: G. Grauwacke; grau gray + wacke wacke. See Gray, and Wacke, an...
Found on
http://www.encyclo.co.uk/local/20973
Gray'wacke` noun [ German
grauwacke ;
grau gray +
wacke wacke. See
Gray , and
Wacke , and confer
Grauwacke .]
(Geol.) A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together. » This term, derived from the
g...Found on
http://www.encyclo.co.uk/webster/G/54
An impure sandstone consisting of rock fragments and grains of quartz and feldspar in a matrix of clay-size particles.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
Graywacke is a metamorphic sandstone in which grains or fragments of various minerals, as quartz and feldspar, or of rocks, as slate and siliceous clay rocks, are embedded in an indurated matrix, which may be siliceous or argillaceous. The colours are grey, red, blue, or some shade of these. The term, as used by the earlier writers, included all th...
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http://www.probertencyclopaedia.com/browse/HG.HTM
A grainy conglomerate stone composed of firmly cemented fragments of quartz.
Found on
http://www.selectstone.com/architectural-resources/stone-glossary/
Sandstone composed of poorly sorted angular clasts.
Found on
http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
Sandstone composed of poorly sorted angular clasts.
Found on
http://www.ucmp.berkeley.edu/glossary/glossary_2.html
() ) A variety of sandstone characterized by angular-shaped grains of quartz and feldspar, and small fragments of dark rock all
Found on
https://www.encyclo.co.uk/local/22327
No exact match found.
