Decomposed granite of silica sand, silt particles, and clay. Different specific granite types have differing propensities to weather, and so differing likelihoods of producing decomposed granite. The parent granite material is a common type of igneous rock that is granular, with its grains large enough to be distinguished with the unaided eye (i.e., it is phaneritic in texture); it is composed of plagioclase feldspar, orthoclase feldspar, quartz, mica, and possibly other minerals. The chemical transformation of feldspar, one of the primary constituents of granite, into the clay mineral kaolin is one of the important weathering processes. The presence of clay allows water
Granite Mountain (Arizona) to interior chaparral. Granite Mountain is a nesting site for the peregrine falcon ("Falco peregrinus"), and the climbing area on the south face is periodically closed to rock climbing, typically from February 1 until July 15 each year. Granite Mountain (Arizona) Granite Mountain () is a mountain located in Yavapai County, Arizona that covers roughly 12 square miles (31 km). It was once known as Mount Gurley, for the first governor of the Arizona Territory, John A. Gurley. Its southwest face has a sheer granite cliff approximately 500 feet (150 m) high that is one of the best locations for