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The thermal behaviour of sacrofanite

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The thermal behaviour of sacrofanite, the ABCABACACABACBACBACABABACABC 28-layer member of the cancrinite sodalite supergroup has been investigated in situ using laboratory focussing-beam X-ray powder diffraction data. Thermal expansion has been analysed from 303 to 873 K. A moderate anisotropy has been observed at T > 473 K, the c -parameter being softer than the a -parameter. At ca. 800 K the unit cell starts to compress owing to (partial) dehydration. Comparison of the heat-induced properties of cancrinite sodalite supergroup minerals has shown no clear relationship between crystal chemical and structural features and their thermal behaviour. Only K-rich pitiglianoite shows a significant negative expansion that has been attributed to the occurrence, as in the case of the zeolite erionite, of a sort of "internal cation exchange" process involving the substitution by K of H2 O residing at the centre of the cancrinite cage. The same behaviour has been invoked to account for the small cell compression of sacrofanite at T>773 K.
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Keywords: CANCRINITE-SODALITE SUPERGROUP; HIGH-TEMPERATURE X-RAY POWDER DIFFRACTION; METHOD; RIETVELD; SACROFANITE; THERMAL BEHAVIOUR

Document Type: Research Article

Publication date: June 1, 2018

This article was made available online on February 27, 2018 as a Fast Track article with title: "The thermal behaviour of sacrofanite".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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