greywacke

[ grey-wak, -wak-uh ]
/ ˈgreɪˌwæk, -ˌwæk ə /

noun

graywacke.

Words nearby greywacke

greyish, greylag, greylist, greynville, greys, greywacke, greywether, grf, gribble, grice, grid

Definition for greywacke (2 of 2)

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

Example sentences from the Web for greywacke

British Dictionary definitions for greywacke

greywacke

US graywacke

/ (ˈɡreɪˌwækə) /

noun

any dark sandstone or grit having a matrix of clay minerals

Word Origin for greywacke

C19: partial translation of German Grauwacke; see wacke

Scientific definitions for greywacke

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.