noun, Chemistry.
a white powder, 3MgSiO 3 ⋅5H 2 O, with variable hydration, insoluble in water or alcohol, used as a rubber filler, a bleaching agent, an odor absorbent, and in the manufacture of paints and resins.
any silicate containing magnesium, as enstatite, talc, or magnesium trisilicate.


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