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Crystal chemistry of a high-pressure C2/c clinopyroxene with six-coordinated silicon

Hexiong Yang and Juergen Konzett
Crystal chemistry of a high-pressure C2/c clinopyroxene with six-coordinated silicon
American Mineralogist (July 2005) 90 (7): 1223-1226

Abstract

A (Ca (sub 0.36) Na (sub 0.56) Mg (sub 0.08) )(Mg (sub 0.73) Si (sub 0.27) )Si (sub 2) O (sub 6) clinopyroxene containing both four- and six-coordinated silicon was synthesized at 15 GPa and 1600 degrees C and its structure determined with single-crystal X-ray diffraction. Unlike the Na(Mg (sub 0.5) Si (sub 0.5) )Si (sub 2) O (sub 6) clinopyroxene that exhibits an ordered P2/n structure with octahedrally coordinated Mg (super 2+) and Si (super 4+) occupying two crystallographically distinct M1 sites (Angel et al. 1988), our sample possesses a C2/c symmetry and shows no detectable ordering between Mg (super 2+) and Si (super 4+) in the M1 site. The measured unit-cell parameters are a = 9.5792(13), b = 8.7588(12), c = 5.2610(6) Aa, beta = 107.199(3) degrees , and V = 421.7(2) Aa (super 3) . The crystal structure of the clinopyroxene reported in this study is comparable to that for omphacites formed under high temperatures and pressures.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 90
Serial Issue: 7
Title: Crystal chemistry of a high-pressure C2/c clinopyroxene with six-coordinated silicon
Affiliation: Florida International University, Center for Study of Matter at Extreme Conditions, Miami, FL, United States
Pages: 1223-1226
Published: 200507
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 21
Accession Number: 2005-049970
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Universitaet Innsbruck, AUT, Austria
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200531
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