From Wikipedia http://en.wikipedia.org/wiki/Wollastonite:
CaSiO3
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Wallastonite is a silicate mineral is comprised of calcium,
silicon, and oxygen. The molecular formula is CaSi03, with a
molecular weight of 116.16 grams per mole.
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plagioclase, microcline, rhodonite, turquoise, wollastonite,
amblygonite, and many more.
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By heating CaCO3 with SiO2, calcium silicate (Ca2SiO4) and carbon dioxide (CO2) are obtained.