Granite is a coarse-grained igneous rock composed essentially of quartz and alcaline feldspar, having as an frequent accessory minerals such as biotite, muscovite and amphibole. Granite is used as an ornamental stone and the civil construction.
For the sector of ornamental stones and cladding, granite term designating a wide range of silicate rocks including monzonite, granodiorite, charnockites, syenite, diorite, dolerite, basalt and granite themselves.
The mineralogical composition of the grains is defined by very different associations of quartz, feldspar, mica (biotite and / or muscovite), amphiboles (mainly hornblende), pyroxene (augite and hypersthene) and olivine. Some of these components may be absent in certain mineralogical associations, with various other minerals found in smaller proportions. Quartz, Quartz, feldspar, mica, and amphibole are the dominant minerals in the granitic and related rocks.
Macroscopically, the quartz is recognized as a colorless mineral, usually translucent, very common in the granites.