graywacke
or grey·wacke
[ grey-wak, -wak-uh ]
/ ˈgreɪˌwæk, -ˌwæk ə /
noun
Geology.
a dark-gray coarse-grained wacke.
Origin of graywacke
1805–15; partly translation, partly adapted from German
Grauwache; see
wacke
Words nearby graywacke
graymail,
grays peak,
graysby,
grayscale,
grayson,
graywacke,
graywater,
graywether,
graz,
graze,
grazier
Example sentences from the Web for graywacke
We're sure to get the better of Graywacke, and why not anticipate?
A Summer in Leslie Goldthwaite's Life. |Mrs. A. D. T. WhitneyIs it primitive, or is it graywacke like Catskill Mountains?
Personal Memoirs Of A Residence Of Thirty Years With The Indian Tribes On The American Frontiers |Henry Rowe Schoolcraft
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.