Arkose

Arkose is a kind of sandstone combining of quartz and with large amounts of feldspar. Sandstones with more than 25% feldspars are generally classified as Arkoses.

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Sandstone: Sandstone is an arenaceous sedimentary rock composed mainly of feldspar and quartz and varies in colour (in a similar way to sand), through grey, yellow, red, and white. Since sandstones often form highly visible cliffs and other rock formations, certain colors of sandstone may be strongly identifi...

Quartz: : For other uses of this word, see Quartz (disambiguation)....

Feldspar: Feldspar is the name of an important group of rock-forming minerals which make up perhaps as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks; they occur as compact minerals, as veins, and are also present in many types of metamorphic rock. Roc...