Round quartz sand is made by crushing and grinding natural Shi Ying, with high Mohs hardness, round particles, no sharp corners and flaky particles, no impurities, high purity, high silicon content and high fire resistance. The appearance is colorless and transparent block, granule or white powder. PH value: 6.0; Quartz stone can be used to make glass, refractory materials, smelt ferrosilicon, metallurgical flux, ceramics, grinding materials, and casting. Quartz stone is used in buildings to make acid-resistant concrete and acid-resistant mortar. This is a customizable product. If you have any specific quotation, material, size and other issues, please contact customer service.