The main parameters of talcum powder are shown in the following figure:

The main component of talc is magnesium silicate containing water in talc, and its molecular formula is Mg3[Si4O 10](OH)2. Talc belongs to monoclinic system. Occasionally, the crystals are pseudohexagonal or rhombic. It is usually in the form of dense blocks, leaves, radiations and fibrous aggregate. Colorless, transparent or white, but it is light green, light yellow, light brown or even light red because it contains a small amount of impurities; Cleavage surface is pearl luster. Hardness 1, specific gravity 2.7 ~ 2.8.