arkose


ar·kose

noun \ˈär-ˌkōs, -ˌkōz\

Definition of ARKOSE

:  a sandstone characterized by feldspar fragments that is derived from granite or gneiss which has disintegrated rapidly
ar·ko·sic \(ˌ)är-ˈkō-sik, -zik\ adjective

Origin of ARKOSE

French
First Known Use: 1829

arkose

noun    (Concise Encyclopedia)

Coarse sandstone that has formed by the disintegration of granite without appreciable decomposition. It thus consists primarily of quartz and feldspar grains. In the absence of stratification, arkose may bear superficial resemblance to granite, and it sometimes has been described as reconstituted granite, or granite wash. Like the granite from which it was formed, arkose is pink or gray.

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