black shale

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black shale

noun black shales

countable, uncountable A dark, muddy rock, rich in sulfides and organic material.

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MLA

"black shale." Wiktionary, via Micwyn, micwyn.com/word/black%20shale. Accessed 6 Nov. 2026.

APA

black shale. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/black%20shale

Chicago

"black shale." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/black%20shale.

BibTeX

@misc{black_shale_2026,
  title = {black shale},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/black%20shale},
  urldate = {2026-11-06}
}