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graywacke

or greywacke

[grey-wak, -wak-uh] /ˈgreɪˌwæk, -ˌwæk ə/
noun
1.
Geology. a dark-gray coarse-grained wacke.
Origin of graywacke
1805-1815
1805-15; partly translation, partly adapted from German Grauwache; see wacke
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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graywacke in Science
graywacke
  (grā'wāk', -wāk'ə)   
Any of various dark gray, coarse-grained sandstones that contain abundant feldspar and rock fragments and often have a clay-rich matrix. Graywackes are thought to originate in environments where erosion, transportation, and deposition happen so quickly that minerals and rock fragments do not have sufficient time to break down into finer constituents.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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