a mineral, calcium silicate, CaSiO 3 , occurring usually in fibrous white masses.

1815–25; named after W. H. Wollaston; see -ite1

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World English Dictionary
wollastonite (ˈwʊləstəˌnaɪt)
a white or grey mineral consisting of calcium silicate in triclinic crystalline form: occurs in metamorphosed limestones. Formula: CaSiO3
[C19: named after W. H. Wollaston (1766--1828), English physicist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
wollastonite   (wl'ə-stə-nīt')  Pronunciation Key 
A white to gray triclinic or monoclinic mineral found in metamorphic rocks and used in ceramics, paints, plastics, and cements. Chemical formula: CaSiO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


white, glassy silicate mineral that commonly occurs as masses or tabular crystals with other calcium-containing silicates (e.g., diopside, tremolite, garnet, and epidote) in metamorphosed limestones. Deposits are found in Ciclova Romina, Rom.; Monte Somma, Italy; and Pargas, Fin. Occurrences in the United States include Utah; Isle Royale, Mich.; Riverside, Calif.; and Essex county, N.Y., where it is mined. For detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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