what is quartz sand

Quartz sand is a hard, wear resistant, stable chemical properties of silicate minerals. The main mineral composition is SiO2.quartz sand, milky white or colorless translucent, 7 hardness, brittle no cleavage, conchoidal fracture, oily luster, density 2.65, bulk density (20-200 mesh is 1.5), the chemical, thermal and mechanical properties has obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1650 ℃.