Wollastonite

Wollastonite is a calcium inosilicate mineral (CaSiO3) with a theoretical makeup of approximately 48% calcium oxide and 52% silicon dioxide. Wollastonite is usually white in color. It may contain small amounts of iron, magnesium, and manganese which can give it a grey, red, or brown tint. 

Wollastonite is an industrially important mineral. It is well known for its good fluorescence. It also has low moisture and absorption properties.