subgraywacke

English

sub- +‎ graywacke

subgraywacke (countable and uncountable, plural subgraywackes)

(mineralogy) 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.

United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).

单词	subgraywacke
释义	subgraywacke English Etymology sub- +‎ graywacke Noun subgraywacke (countable and uncountable, plural subgraywackes) (mineralogy) 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. References United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).
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