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GEOREF RECORD

Al (sub 3) Si (sub 2) O (sub 7) (OH) (sub 3) , phase Pi (formerly piezotite); crystal structure of a synthetic high-pressure silicate rediscovered

Peter Daniels and Bernd Wunder
Al (sub 3) Si (sub 2) O (sub 7) (OH) (sub 3) , phase Pi (formerly piezotite); crystal structure of a synthetic high-pressure silicate rediscovered
European Journal of Mineralogy (December 1996) 8 (6): 1283-1292

Abstract

The crystal structure of the triclinic high-P phase with this composition (a 6.0885, b 7.2832, c 7.7234 Aa, alpha 115.71, beta 88.85, Gamma 92.89 degrees , space group P1, Z = 2), here named phase Pi, is based on a cubic closest packing of oxygen atoms. The characteristic pattern of occupied polyhedra produces layers of interconnected AlO (sub 6) octahedra and single SiO (sub 4) tetrahedra. The most probable location of H atoms (not found in the X-ray single-crystal analysis) is derived from calculated bond valence sums. Comparison with other structures in the system Al (sub 2) O (sub 3) -SiO (sub 2) -H (sub 2) O relates phase Pi to phyllosilicates and other neso-subsilicates with similar chemical composition; structure comparisons also show that in this system there are trends in the development of polyhedral topologies and oxygen packing with increasing P.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 6
Title: Al (sub 3) Si (sub 2) O (sub 7) (OH) (sub 3) , phase Pi (formerly piezotite); crystal structure of a synthetic high-pressure silicate rediscovered
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Mineralogie, Bochum, Federal Republic of Germany
Pages: 1283-1292
Published: 199612
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 1997-018104
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199706
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