Wollastonite

Wollastonite is a calcium silicate mineral, CaSiO₃, usually white or gray. It commonly forms when silica-rich fluids or rocks react with limestone during metamorphism and is used in ceramics, paints, and plastics.

Pyroxenoid: A mineral group with chains of silicate tetrahedra arranged differently from those in pyroxenes. Wollastonite belongs to this group, whose chain structure distinguishes it from pyroxenes.
Ceramics: Inorganic, nonmetallic materials shaped and hardened by heat. Wollastonite can improve firing behavior and reduce shrinkage in ceramic bodies.
Calcium silicate: A compound containing calcium, silicon, and oxygen, with proportions and structures that vary among minerals and materials. Wollastonite is the naturally occurring mineral form with the composition CaSiO₃.
Wollastonite deposits of Willsboro, New York: A major wollastonite-bearing deposit in Essex County, New York. This deposit illustrates economically mined wollastonite in metamorphosed carbonate rocks.
Contact metamorphism: Rock alteration caused chiefly by heat from nearby magma. Heating limestone near intrusions can produce wollastonite through reactions with silica.
Polymer composites: Materials made by combining polymers with reinforcing or modifying substances. Ground wollastonite reinforces plastics and can improve stiffness and dimensional stability.
Silicate mineral: A mineral built from silicon–oxygen units combined with other elements. Wollastonite’s silicate chains place it within the largest mineral class.
Långban: A Swedish mining district renowned for diverse minerals in metamorphosed manganese-rich rocks. Wollastonite occurs among the district’s complex metamorphic mineral assemblages.
Skarn: A coarse-grained metamorphic rock formed by chemical exchange between intrusions and surrounding carbonate rocks. Wollastonite commonly occurs in skarns formed where silicate-rich fluids reach limestone.
Paint: A liquid or paste coating that forms a protective or decorative film when applied. Wollastonite serves as a functional extender that can improve durability and control gloss.

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