Talc is a hydrothermal alteration mineral. Magnesium rich minerals are often changed into talc by hydrothermal 

alteration, so talc is often the appearance of olivine, enstatite, amphibole, tremolite and other minerals. Talc 

is a common silicate mineral that is very soft and has a slippery feel. Ten minerals have been selected to repre

-sent ten levels of hardness, called Morse hardness, in which soft talc can be used instead of chalk to make white 

marks. Talc is generally lumpy, blade-like, fibrous, or radial, and is white, off-white in color, and can be color

-ed by other impurities. Talc has many uses, such as refractories, papermaking, rubber fillers, pesticide absorbent, 

leather coatings, cosmetic materials and carving materials, etc.