subgraywacke

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noun

The most common type of sandstone, intermediate in composition between orthoquartzite and graywacke, typically composed of 30% to 65% quartz and chert, less than 15% clay matrix, more than 25% unstable materials such as feldspar grains and rock fragments, and voids or mineral cement exceeding the amount of clay matrix, and being lighter colored and better sorted, and with less matrix, than graywacke.

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Meanings

nounsubgraywacke (countable and uncountable, plural subgraywackes)

plural subgraywackes

  1. countableuncountablechemistryThe most common type of sandstone, intermediate in composition between orthoquartzite and graywacke, typically composed of 30% to 65% quartz and chert, less than 15% clay matrix, more than 25% unstable materials such as feldspar grains and rock fragments, and voids or mineral cement exceeding the amount of clay matrix, and being lighter colored and better sorted, and with less matrix, than graywacke.

Origin

From sub- + graywacke.

Full word history & related roots →
Cite this entry
APA

subgraywacke. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/subgraywacke

MLA

“subgraywacke.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/subgraywacke. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “subgraywacke,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/subgraywacke.

Source: subgraywacke on Wiktionary, CC BY-SA 4.0.