NaturalCrystalQuartz Is a Quartz Crystal Mineral, and Its Main Chemical Composition IsSilica, Chemical Formula Is SiO 2, AliasCrystal water, Shui Bi,Water Jade. Well-Developed Single Crystals Are Hexagonal Cones, So They Are Usually Massive Or Granular Aggregate. Generally, It Is Colorless, Gray and Milky White, and It Is Purple, Red, Smoke (Tea), Yellow and Green When Containing Other Mineral Elements.