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X-ray single-crystal structure refinement of an OH-rich topaz from Sulu UHP terrane (eastern China); structural foundation of the correlation between cell parameters and fluorine content

Augusta Alberico, Simona Fernando, Gabriella Ivaldi and Giovanni Ferraris
X-ray single-crystal structure refinement of an OH-rich topaz from Sulu UHP terrane (eastern China); structural foundation of the correlation between cell parameters and fluorine content (in Ninth international symposium on Experimental mineralogy, petrology and geochemistry, Peter Ulmer (convener))
European Journal of Mineralogy (October 2003) 15 (5): 875-881

Abstract

An OH-rich topaz, Al (sub 2) SiO (sub 4) F (sub 1.4) OH (sub 0.6) , occurring in a kyanite quartzite of the Sulu UHP terrane (eastern China) has been optically and chemically (electron microprobe) characterised and its crystal structure refined by single-crystal X-ray diffraction data. Anisotropic refinement converged to R = 0.024 in the Pbnm space group with cell parameters a = 4.6696(8) Aa, b = 8.8486(17) Aa, c = 8.3915(22) Aa. The position of the hydrogen atom has been detected; because the OH-->F substitution is less than 50%, the disorder of H does not lower the overall symmetry. The influence of the OH-->F substitution on the lattice parameters is discussed in terms of crystal structure and shown to affect primarily the a and b cell edges; instead c is almost constant. A critical revision of earlier linear correlations of the F content (w (sub F) ) vs the lattice parameters and the availability of new data recently published, allowed to obtain improved regression lines for w (sub F) vs a (r (super 2) = 0.982) and b (r (super 2) = 0.968) cell edges.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 5
Title: X-ray single-crystal structure refinement of an OH-rich topaz from Sulu UHP terrane (eastern China); structural foundation of the correlation between cell parameters and fluorine content
Title: Ninth international symposium on Experimental mineralogy, petrology and geochemistry
Affiliation: Universita di Torino, Dipartimento di Scienze Mineralogiche e Petrologiche, Turin, Italy
Affiliation: ETH Zurich, Institute for Mineralogy, Zurich, Switzerland
Pages: 875-881
Published: 200310
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Ninth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Zurich, CHE, Switzerland
Meeting date: 20020324March 24-27, 2002
References: 23
Accession Number: 2004-020042
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200406
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