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Wollastonite
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Wollastonite, a calcium metasilicate (CaSiO3), has a theoretical composition of 48.3% calcium oxide and 51.7% silicon dioxide but may contain trace to minor amounts of aluminum, iron, magnesium, manganese, potassium, and sodium.  It occurs as prismatic crystals that cleave into massive-to-acicular fragments.  It is usually white, but also may be gray, brown, or red depending on its composition.  Deposits of wollastonite have been found in Arizona, California, Idaho, Nevada, New Mexico, New York, and Utah.  These deposits are typically skarns containing wollastonite as the major component and calcite, diopside, garnet, idocrase, and (or) quartz as minor components.  Major uses for wollastonite are in plastics, ceramics, metallurgy, paint, and friction products and as asbestos substitutes.

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