Arkose definitions and example sentences on Wordnik

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Definitions (2)

Feldspathic sandstone; a rock consisting essentially of more or less consolidated quartzose sand with grains or particles of orthoclase disseminated through it, and frequently containing also some mica and kaolin. The feldspar seems, in some cases, to have been derived from the disintegration of rock containing that mineral; in others, to have resulted from the meta-morphism of sandstone containing argillaceous material. The rock to which the name arkose has been given occurs chiefly in the Lower Silurian, Carboniferous, and Triassic formations.

The Triassic rocks are mainly red sandstones, -- often feldspathic, or arkose, with some conglomerates and shales. — The Elements of Geology
Pressure has hardened the marine muds, the arkose, or the volcanic ash from which slates are derived, and has caused them to cleave by the rearrangement of their particles. — The Elements of Geology