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
Dedham Granite notable building projects in and around Dedham. It was used for St. Mary's Church (1880), St. Paul's Church (1858), Memorial Hall (1868), the Boston and Providence Railroad station (1882), the Dedham Public Library (1888), Trinity Church in Copley Square. There are several pieces of it arraigned decoratively along East Street in Dedham, between High and Avery Streets. These pieces were remnants of the railroad abutment that was dismantled in 2008. Plymouth Rock is also a piece of Dedham Granite, having been moved to the coast by a glacier 20,000 years ago. Dedham Granite Dedham Granite is a light grayish-pink to