graywacke

noun
gray·​wacke | \ˈgrā-ˌwak, -ˌwa-kə\

Definition of graywacke 

: a coarse usually dark gray sandstone or fine-grained conglomerate composed of firmly cemented fragments (as of quartz or feldspar)

First Known Use of graywacke

1805, in the meaning defined above

History and Etymology for graywacke

partial translation of German Grauwacke

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The first known use of graywacke was in 1805

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