<P> Most sandstone is composed of quartz or feldspar because they are the most resistant minerals to weathering processes at the Earth 's surface , as seen in Bowen 's reaction series . Like uncemented sand , sandstone may be any color due to impurities within the minerals , but the most common colors are tan , brown , yellow , red , grey , pink , white , and black . Since sandstone beds often form highly visible cliffs and other topographic features , certain colors of sandstone have been strongly identified with certain regions . </P>
the most stable mineral at the earth 's surface
quartz feldspar