Arkose (
IPA: ) is a
detrital sedimentary rock, specifically a type of
sandstone containing at least 25%
feldspar., Arkosic sand is
sand that is similarly rich in feldspar, and thus the potential precursor of arkose. The other mineral components may vary, but
quartz is commonly dominant, and minor
mica is often present. Apart from the mineral content, rock fragments may also be a significant component. Arkose usually contains small amounts of
calcite cement, which causes it to effervesce slightly in dilute
hydrochloric acid; sometimes the cement also contains
iron oxide. Arkose is typically grey to reddish in colour. The sand grains making up an arkose may range from fine to very coarse, but tends toward the coarser end of the scale.
Fossils are rare in arkose, due to the depositional processes that form it, although bedding is frequently visible.
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