arkose

arkose

[ahr-kohs]
noun
a granular sedimentary rock composed of quartz and feldspar or mica; a feldspathic sandstone.

Origin:
1830–40; < French

arkosic, adjective
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World English Dictionary
arkose (ˈɑːkəʊs)
 
n
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 10th Edition
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American Heritage
Science Dictionary
arkose   (är'kōs)  Pronunciation Key 
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).
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