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Crystal structure of spinelloid II in the system Fe (sub 3) O (sub 4) -Fe (sub 2) SiO (sub 4)

Ross J. Angel and Alan B. Woodland
Crystal structure of spinelloid II in the system Fe (sub 3) O (sub 4) -Fe (sub 2) SiO (sub 4)
European Journal of Mineralogy (June 1998) 10 (3): 607-611


The crystal structure of Fe (sub 2.57) Si (sub 0.43) O (sub 4) synthesized at 1200 degrees C and 4.0 GPa has been determined. It is isotypic with the spinelloid II structure found in the NiAl (sub 2) O (sub 4) -Ni (sub 2) SiO (sub 4) and the NiGa (sub 2) O (sub 4) -Ni (sub 2) SiO (sub 4) systems; space group Imma; a 5.85928, b 17.9801, c 8.38395 Aa, V 883.252 Aa. The structure contains two symmetrically distinct tetrahedral sites which together form T (sub 3) O (sub 10) groups; both tetrahedra are partially occupied by both Fe (super 3+) and Si (super 4+) , with the central tetrahedral site of each group being enriched in Si (super 4+) relative to the terminal sites. The only octahedral site bonded to the bridging oxygen of the T (sub 3) O (sub 10) groups appears to be occupied by Fe (super 2+) alone, while the remaining three distinct octahedral sites are smaller and appear to contain both Fe (super 2+) and Fe (super 3+) .

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 3
Title: Crystal structure of spinelloid II in the system Fe (sub 3) O (sub 4) -Fe (sub 2) SiO (sub 4)
Affiliation: Universitaet Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany
Pages: 607-611
Published: 199806
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 1998-046916
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Universitaet Heidelberg, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199818
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