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graywacke
or grey·wacke
[ grey-wak, -wak-uh ]
/ ˈgreɪˌwæk, -ˌwæk ə /
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noun
Geology. a dark-gray coarse-grained wacke.
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Origin of graywacke
1805–15; partly translation, partly adapted from German Grauwache;see wacke
Words nearby graywacke
Grayson, Grays Peak, gray squirrel, gray trout, gray urn, graywacke, gray water, graywether, gray whale, gray wolf, Graz
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use graywacke in a sentence
Scientific definitions for graywacke
graywacke
[ grā′wăk′, -wăk′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
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