Quartz sand is a hard, wear-resistant, and chemically stable silicate mineral whose main mineral component is SiO2. The colors of quartz sand are varied, often milky white, colorless, and gray. The hardness is 7, brittle, with no cleavage, and conchoidal fracture. Grease gloss, density is 2.65g/cm3, and its chemical, thermal and mechanical properties have obvious anisotropy.