Arkose

About it

Sandstone with at least a quarter feldspar grains, so it often looks pink and grainy, like crumbled granite. It forms near eroding granite; the Fountain Formation at Red Rocks, Colorado, is arkose.

Type

Rock (sedimentary)

Group

Sedimentary (clastic)

Lustre

dull

Colours

pink, red, tan, grey

Transparency

opaque

Typical values: real specimens vary. For more, see mindat.org.