Abstract

β-WOLLASTONITE (CaSiO3) comprises both triclinic wollastonite and monoclinic parawollastonite1. These forms are not easily distinguishable except by single-crystal X-ray work, since they differ only in the reflexions with k odd, and these are always weak. A new type of infinite-chain silicate structure has recently been proposed2 for β-wollastonite from X-ray crystallographic work on projections. The three-dimensional work on parawollastonite from Crest-more, California, which is reported here confirms this type-structure.

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