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GEOREF RECORD

The thermal behaviour of sacrofanite

Paolo Ballirano
The thermal behaviour of sacrofanite
European Journal of Mineralogy (May 2018) 30 (3): 507-514

Abstract

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 H (sub 2) 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.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 30
Serial Issue: 3
Title: The thermal behaviour of sacrofanite
Author(s): Ballirano, Paolo
Affiliation: Sapienza Universita di Roma, Dipartimento di Scienze della Terra, Rome, Italy
Pages: 507-514
Published: 201805
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 45
Accession Number: 2018-088870
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201848
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