The crystal is transparent quartz crystalloid. To know about the crystal, we need to learn about the mineral of quartz first. Quartz is one of the minerals that distributes widely in the earth’s crust. Its chemical property is silica and the chemical formula is SiO2. The quartz has a large family, which can be divided into three categories: phanerocrystalline, cryptocrystalline and amorphous. The crystal belongs to the category of phanerocrystalline, which means the transparent quartz crystalloid.

The crystal is usually colorless and transparent, but when it contains the impurities of some...