A clastic sedimentary rock composed of quartz and feldspar fragments, usually from granite or gneiss. If you want to see a really big hunk of it in person, travel to Australia and visit Ayers Rock.
I am not a geology expert, please correct me if you are, and my pathetic explanation has offended you.
Ar*kose" (?), n. [F] (Petrog.)
A sandstone derived from the disintegration of granite or gneiss,
and characterized by feldspar fragments. -- Ar*kos"ic
© Webster 1913.
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