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Wollastonite is a calcium inosilicate mineral (CaSiO3) that may contain small amounts of iron, magnesium and manganese substituting for calcium.
Some of the properties that make wollastonite so useful are its high brightness and whiteness, low moisture and oil absorption, and low volatile content.
Wollastonite is used primarily in ceramics, friction products (brakes and clutches), metal making, paint filler and plastics.