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The thermal expansion of staurolite, Fe4Al18Si8O44(OH)4

Published online by Cambridge University Press:  05 July 2018

K. Gibbons ,
M. J. Dempsey  and
C. M. B. Henderson
K. Gibbons
Affiliation:
Department of Geology, University of Manchester, Manchester M13 9PL, England
M. J. Dempsey
Affiliation:
Department of Geology, University of Manchester, Manchester M13 9PL, England
C. M. B. Henderson
Affiliation:
Department of Geology, University of Manchester, Manchester M13 9PL, England
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Abstract

The thermal expansion of iron end-member staurolite has been studied by high-temperature powder X-ray diffraction methods and by modelling with the Distance Least Squares (DLS) computer program. The X-ray approach was complicated by dehydroxylation of the staurolite. Mean linear expansion coefficients for the a, b, and c cell edges of dehydroxylated staurolite determined by the X-ray method are (× 10−6 °C−1); 20–500 °C, 8.93, 8.23, and 7.95, respectively, and 20–800 °C, 7.85, 9.43, and 9.13, respectively. Expansion coefficients of a, b, and c calculated for hydroxylated staurolite using the DLS program over the same temperature ranges are (7.86, 7.18, and 7.55 × 10−6 °C−1) and (7.87, 7.17, and 7.57 × 10−6 °C−1). The good agreement between the results from the two methods supports the use of computer modelling in estimating the thermal expansion behaviour of complex structures. The latter approach could be preferable for studying hydrated minerals.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 333 , March 1981 , pp. 69 - 72
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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