Pegmatites are extremely coarse-grained rocks with this composition.
Pegmatites are extremely coarse-grained rocks with this composition. Rapid erosion of this rock can result in the formation of arkose sandstones. The dominant minerals are orthoclase and quartz, and it has rough texture. More felsic than diorite, this common intrusive rock is compositionally equivalent to rhyolite. FTP, name this rock which makes up Mount Rushmore National Memorial.
Pegmatites are extremely coarse-grained rocks with this composition.
{granite} (accept {granitic} before “this rock”)  .