The harm of silica powder to the skin
The main component of sand is silicaCrystalline silica is divided into three kinds: quartz, scale quartz and square quartz because of their different crystal structures. Pure quartz is a colorless crystal, large and transparent, prism like quartz called crystal.
Harmless, the most common is sand. Silica mineral refers to the same chemical formula (SiO), but there are differences in the structure of minerals, these minerals are called as different as the main body, including quartz, cristobalite and tridymite. These minerals are found mainly in granite, sandstone, and black earth on earth. There are two kinds of crystalline silica and amorphous silica in nature.
If they contain trace impurities in crystal with different colors, amethyst, Citrine etc.. Ordinary sand is quartz fine sand, a (iron impurity) and white sand (less impurities, Jiao Chunjing).
