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 Railway past, many persons were injured — and some killed — while diving into the flooded abandoned quarries from great heights. The Department of Conservation and Recreation maintains the Quincy Quarries Reservation, which has facilities for rock climbing, and trails connecting the remains of the Granite Railway. Granite Railway The Granite Railway was one of the first railroads in the United States, built to carry granite from Quincy, Massachusetts to a dock on the Neponset River in Milton. From there boats carried the heavy stone to Charlestown for construction of the Bunker Hill Monument. The Granite Railway is popularly termed the