Arkose is a comparatively young, medium-grained sedimentary rock, resembling sandstone, which consists
of quartz with up to 30% feldspar.
Arkose forms in marine and freshwater sediments and continental deposits, usually
from the breakdown of granite. It is pale
gray to pink in color.
|A sample of arkose from Mount Tom, Massachusetts. Credit: R.Weller/Cochise College
AND PLANETARY SCIENCE