Quartz and quartzite

Key Attributes.

SPECIFICATION : SiO2 = 99 % Min SiO2 = More than 85% Quartz is the most commonly and abundant mineral in the Earth's crust (although feldspar is more common in the world as a whole). It is made up of a lattice of silica (SiO2) tetrahedra. Quartz has a hardness of 7 on the Mohs scale and a density of 2.65 g/cm³. Quartz is said to be free silica, because it does not form part of the other rock forming silicate minerals which are satisfied. In other words it is not used up in the chemical make up of the other minerals in the rock.