Talcum powder is a fine powder obtained by mechanically crushing talc ore after removing impurities. Processed and purified talcum powder has a high negative ion generation rate and far-infrared emission rate. Talc is also known as Tourmaline. Tourmaline, chemically represented as NaR3Al6Si6O18BO33(OH,F)4, is a general term for a group of cyclic silicate minerals belonging to the trigonal crystal system. In this formula, R represents a metal cation; when R is Fe2+, it forms a black crystal tourmaline. Tourmaline crystals are nearly triangular in columnar shape, with different crystal forms at both ends, a columnar surface with longitudinal streaks, often occurring in columnar, needle-like, radiating, and massive aggregates. It has a glassy luster, a resinous luster on the fracture, and is semi-transparent to transparent. It does not have cleavage. Its Mohs hardness is 7-7.5, and its specific gravity is 2.98-3.20. It has piezoelectric and pyroelectric properties.