Abstract
WE have recently made some predictions about the crystal structure of foshagite, based on a study of the dehydration process at 700° C. together with electron diffraction and X-ray fibre evidence1. There were strong indications that the structure consists of calcium and hydroxyl ions, and metasilicate chains resembling those in wollastonite2, and the approximate positions of the calcium ions were suggested. A complete trial structure is now postulated, and more detailed consideration of the X-ray evidence shows that it is essentially correct.
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References
Gard, J. A., and Taylor, H. F. W., Amer. Mineralogist, 43, 1 (1958).
Dornberger-Schiff, K., Liebau, F., and Thilo, E., Acta Cryst., 8, 752 (1955). Mamedov, Kh. S., and Belov, N. V., Doklady Akad. Nauk S.S.S.R., 107, 463 (1956). Buerger, M. J., Proc. U.S. Nat. Acad. Sci., 42, 113 (1956). Tolliday, J., Nature, 182, 1012 (1958).
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GARD, J., TAYLOR, H. Crystal Structure of Foshagite (Ca4Si3O9(OH)2). Nature 183, 171–173 (1959). https://doi.org/10.1038/183171b0
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DOI: https://doi.org/10.1038/183171b0
