Arkose



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

The lowest cretaceous rocks yet found are composed of an arkose, derived in large part from the original igneous mass.
The History of Cuba, vol. 1 Willis Fletcher Johnson

At the base there is often an arkose, composed largely of fragments of serpentine and granite derived from the ancient floor.
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 Various

noun
a sandstone consisting of grains of feldspar and quartz cemented by a mixture of quartz and clay minerals
arkose
(är’kōs)
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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