Abstract
The structure of wollastonite CaSiO3 is characterized by chains of [SiO4]-tetra-hedra which extend parallel to the y-axis and have a three-repeat (b = 7.32 Å). The chains are held together by interstitial Ca which is in a distorted six fold co-ordination. Fig. 1 a shows a z-projection of the structure of triclinic wollastonite as determined by Mamedov and Belov (1956) from two-dimensional film data. Ito (1950) recognized the pseudosymmetry which is evident both in lattice constants (cosyγ ≈ b/4a) and by comparing intensities on X-ray diffraction patterns (see, e.g. Wenk, 1969). He pointed out a pseudomonoclinic cell (dashed area in Fig. 1 a) but this setting does not do justice to the symmetry centers in the P1̄ structure.
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References
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Wenk, HR., Müller, W.F., Liddell, N.A., Phakey, P.P. (1976). Polytypism in Wollastonite. In: Wenk, HR. (eds) Electron Microscopy in Mineralogy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66196-9_24
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DOI: https://doi.org/10.1007/978-3-642-66196-9_24
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