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arkose

[ ahr-kohs ]
/ ˈɑr koʊs /
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noun

a granular sedimentary rock composed of quartz and feldspar or mica; a feldspathic sandstone.

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Origin of arkose

Borrowed into English from French around 1830–40
ar·ko·sic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for arkose

arkose
/ (ˈɑːkəʊs) /

noun

a sandstone consisting of grains of feldspar and quartz cemented by a mixture of quartz and clay minerals
C19: from French
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for arkose

arkose
[ ärkōs ]

A usually pinkish or red sandstone consisting primarily of quartz and feldspar. Arkose usually forms as the result of the rapid disintegration of granite in areas of vigorous erosion. Its grains are usually angular and poorly sorted (mixed randomly in differing sizes).
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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