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CaSiO3 A white to gray inosilicate mineral (a pyroxenoid) that crystallizes in the triclinic system in tabular crystals and has a pearly or silky luster on the cleavages; hardness is 5-5.5 on Mohs scale, and specific gravity is 2.85. Also known as tabular spar.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(named after the English scientist W. H. Wollaston, 1766-1828), also tabular spar, a silicate mineral with a chain structure and a circular radical. Its chemical formula is Ca3(Si3O9), and it sometimes contains traces of iron. Wollastonite crystallizes in a triclinic system, forming flat tabular crystals as well as radiated and conchoidal aggregates; its color is white and sometimes pink. It has a hardness of 5-5.5 on the mineralogical scale and a density of 2,780-2,920 kg/m3. Wollastonite is formed by contact and plutonic regional metamorphism of limestones.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Wollastonite is a naturally occurring nonmetallic calcium metasilicate, [CaSiO.sub.3].
Wollastonite is a natural nonmetallic calcium metasilicate, [CaSiO.sub.3].