Granite and feldspar. The term "granitic" means granite-like and is applied to granite and a group of intrusive igneous rocks with similar textures and slight variations in composition and origin. These rocks mainly consist of feldspar, quartz, mica, and amphibole minerals, which form an interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende) peppering the lighter color minerals. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic texture is known as a granite porphyry. Granitoid is a
Granite, Virginia Granite, Virginia Granite was an unincorporated community in Chesterfield County, Virginia. It was originally located along the Richmond and Danville Railroad five miles west of Manchester and about a mile south of the rapids of the James River along Powhite Creek. According to documents on file at the Library of Virginia, in April 1872, notice was published in Petersburg that Mathew Hall had been appointed postmaster of a new U.S. Post Office at Granite. Granite was named for the granite rock formations which underlie the rapids of the river at the geological fall line which begin downstream from the current