Wollastonite is a single chain silicate mineral. Usually it is flaky, radially or fibrous aggregates. Its characteristics are non-toxic, chemical resistance, thermal stability and dimensional stability, good glass and pearl luster, low water absorption, low oil absorption, low conductivity, good insulation. Its Mohs hardness is 4.5 ~ 5, density 2.75 ~ 3.10g/cm3.