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
California Coastal Comm'n v. Granite Rock Co. still owns the land. California Coastal Comm'n v. Granite Rock Co. California Coastal Comm'n v. Granite Rock Co., 480 U.S. 572 (1987), is a United States Supreme Court case addressing the question of whether United States Forest Service regulations, federal land use statutes and regulations, or the Coastal Zone Management Act of 1972, preempt the California Coastal Commission's imposition of a permit requirement on operation of an unpatented mining claim in a national forest. The court ruled that even if federal land is not included in the Coastal Zone Management Act's interpretation of "coastal zone," the act does not automatically