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GEOREF RECORD

The crystal structure of synthetic TlAlSi (sub 3) O (sub 8) ; influence of the inert-pair effect of thallium on the feldspar structure

Atsushi Kyono and Mitsuyoshi Kimata
The crystal structure of synthetic TlAlSi (sub 3) O (sub 8) ; influence of the inert-pair effect of thallium on the feldspar structure (in Eighth international symposium on Experimental mineralogy, petrology and geochemistry, Anonymous)
European Journal of Mineralogy (October 2001) 13 (5): 849-856

Abstract

The crystal structure of TlAlSi (sub 3) O (sub 8) (a 8.882, b 13.048, c 7.202 Aa, beta 116.88 degrees , V 744.5 Aa (super 3) , Z = 4, space group C2/m) was determined to R 7.33%. The underlying framework is basically similar to that of RbAlSi (sub 3) O (sub 8) and can be regarded as isotypic with sanidine. The structure accommodates Tl (super +) occupying the M site coordinated by nine O atoms. The more expanded Tl polyhedra, compared to the Rb polyhedra (despite the small ionic radius of Tl (super +) relative to Rb (super +) ), result from the behaviour of the stereoactive lone-pair electrons of Tl (super +) termed 'inert-pair effect'. The difference in centroid-central atom distance in the TlO (sub 9) polyhedron suggests that the lone-pair electrons are orienting [001] in the feldspar structure. Therefore, Tl found as a trace element in natural K-feldspars can be considered as a true constituent of the mineral.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 5
Title: The crystal structure of synthetic TlAlSi (sub 3) O (sub 8) ; influence of the inert-pair effect of thallium on the feldspar structure
Title: Eighth international symposium on Experimental mineralogy, petrology and geochemistry
Author(s): Kyono, AtsushiKimata, Mitsuyoshi
Author(s): Anonymous
Affiliation: University of Tsukuba, Institute of Geoscience, Ibaraki, Japan
Pages: 849-856
Published: 200110
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Eighth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Bergamo, ITA, Italy
Meeting date: 20000416April 16-19, 2000
References: 32
Accession Number: 2001-075360
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200123
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