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The main component of talc is magnesium silicate hydrated in talc. The formula is Mg3 [Si4O10] (OH).

Source:https://baike.baidu.com/item/滑石粉/894146     Release time:2019/3/19 10:29:00

Talc belongs to monoclinic system. Crystals are pseudohexagonal or diamond-shaped sheets, occasionally. Usually dense, massive, leafy, radial, fibrous aggregates. It is colorless, transparent or white, but it is light green, light yellow, light brown or even light red due to a small amount of impurities. The cleavage surface is pearly luster. Hardness 1, specific gravity 2.7-2.8.