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wollastonite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

wollastonite Member of the nesosilicates (chain silicates) CaSiO3 and associated with the pyroxenes, although it does not possess a pyroxene atomic lattice and is termed a pyroxenoid (along with pectolite (Ca2NaH[SiO3]3) and rhodonite); sp. gr. 2.8–3.1; hardness 4.5–5.0; triclinic; white to grey; vitreous to pearly lustre; crystals tabular, prismatic, also occurs massive and cleavable, or fibrous; cleavage perfect {100}; occurs in metamorphosed, silicaceous limestones, and alkaline, igneous rocks, and associated with calcite, epidote, and tremolite; soluble in hydrochloric acid with the separation of silica. It is used as a source mineral for rock wool of high strength and with long fibres, and is named after the British mineralogist W. H. Wollaston.

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