Silica content of 98.5% over that of quartz stone, silica content of 98.5 percent in the following called silica. Quartz Stone after the crushing of quartz sand, quartz sand-refining, ordinary models. Characteristics: quartz sand hardness of 7, the proportion of 2.65, was milky white color, light yellow, brown and grey, quartz sand with a higher fire-resistant properties, melting point of 1730 degrees Celsius. Use: manufacturing glass, refractories, smelting ferrosilicon, metallurgical flux, ceramics, paper, grinding material, casting, quartz sand in the construction of the use of its strong acid etching medium capacity for production of concrete and acid Acid mortar.