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Al,Si order in the crystal structure of alpha -eucryptite (LiAlSiO (sub 4) )

Peter Daniels and Colin A. Fyfe
Al,Si order in the crystal structure of alpha -eucryptite (LiAlSiO (sub 4) )
American Mineralogist (March 2001) 86 (3): 279-283

Abstract

The crystal structure of alpha -eucryptite, LiAlSiO (sub 4) , is reinvestigated by combining (super 29) Si NMR spectroscopy and single-crystal X-ray diffraction. The silicon coordination in alpha -eucryptite of three different samples (two of natural, one of synthetic origin) is shown to be identical on a local scale by means of (super 29) Si MAS NMR spectroscopy. This method also suggests a well ordered arrangement of Si and Al within the crystal structure of alpha -eucryptite and the presence of two symmetrically non-equivalent sites for silicon. The refinement of the structure of a natural crystal using single-crystal X-ray diffraction confirms these observations and demonstrates the presence of long-range Al-Si order and the acentric space group R3.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 86
Serial Issue: 3
Title: Al,Si order in the crystal structure of alpha -eucryptite (LiAlSiO (sub 4) )
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Mineralogie, Bochum, Federal Republic of Germany
Pages: 279-283
Published: 200103
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 15
Accession Number: 2001-039396
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N52°30'00" - N75°00'00", E82°00'00" - E139°00'00"
S22°30'00" - S15°30'00", E25°15'00" - E33°00'00"
Secondary Affiliation: University of British Columbia, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200112
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