Abstract
Cameron and Ashworth1 have postulated an ordered Si/Al distribution in fibrolite, the fine-grained variety of sillimanite, on the basis of two properties, space group determination by diffraction methods and infrared data. The crystal structure of ordered sillimanite (space group Pbnm) exhibits a pseudo-repeat of one half in the c direction2. The two halves in sillimanite differ both in the distribution of Si and Al over the two tetrahedral sites as well as in slight differences of the x and y parameters of most of the metal and oxygen atoms, whereas in disordered mullite (space group Pbam) these tre parameters are statistically identical3.
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References
Cameron, W. E., and Ashworth, J. R., Nature Physical Science, 235, 134 (1972).
Burnham, C. W., Z. Krist., 118, 127 (1963).
Burnham, C. W., Carnegie Inst. Wash. Year Book, 63, 223 (1963).
Holdaway, M. J., Amer. J. Sci., 271, 97 (1971).
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SAHL, K., SEIFERT, F. Relationship of Fibrolite to Sillimanite. Nature Physical Science 241, 46–47 (1973). https://doi.org/10.1038/physci241046a0
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DOI: https://doi.org/10.1038/physci241046a0
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