Talc is hydrothermal alteration minerals. Magnesium rich minerals by hydrothermal alteration often change as talc, talc with olivine,

 the pyroxene, amphibole, tremolite and other minerals. Talc is a kind of common silicate minerals, it is very soft and has a creamy feel.

 People have been selected to represent the 10 mineral10hardness level, known as the Moss hardness, in which10 levels, the first ( it is 

the most soft one) is talc. Soft talc can replace the chalk to draw the traces of white. Talc is usually massive, leaf shape, fiber or radially, 

color is white, gray, and with other impurities in various colors. Talc has many uses, such as refractory material, papermaking, rubber filler,

 pesticide, leather coatings, cosmetic absorbent material and carving materials and so on.

The general process for: jet mill and mechanical grinder