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. of activities on federal lands. Granite Rock Company of Watsonville, California purchased the property and mineral rights to a large deposit of white limestone on Mount Pico Blanco in the Los Padres National Forest on the Big Sur coast of California in 1963. The limestone deposit is made up of two large, pharmaceutical grade limestone bodies known as the Pico Blanco body and the Hayfield body. It is the only high-grade deposit on the Pacific Coast outside Alaska within three miles of potential marine transportation. Reserves have been estimated to be from 600 million to a billion tons, reportedly the