greywacke

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greywacke

/ˈɡɹeɪ.wak.ə/ UK
/ˈɡɹeɪ.wæk/

Where it comes from

Anglicised form of grauwacke.

noun greywackes · graywacke

countable, uncountable A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix. Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.

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noun hard dark sandstone

Русский	граува́кка grauvákka

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MLA

"greywacke." Wiktionary, via Micwyn, micwyn.com/word/greywacke. Accessed 6 Nov. 2026.

APA

greywacke. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/greywacke

Chicago

"greywacke." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/greywacke.

BibTeX

@misc{greywacke_2026,
  title = {greywacke},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/greywacke},
  urldate = {2026-11-06}
}