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Rietveld refinement of okayamalite, Ca (sub 2) SiB (sub 2) O (sub 7) ; structural evidence for the B/Si ordered distribution

G. Giuli, L. Bindi and P. Bonazzi
Rietveld refinement of okayamalite, Ca (sub 2) SiB (sub 2) O (sub 7) ; structural evidence for the B/Si ordered distribution
American Mineralogist (October 2000) 85 (10): 1512-1515

Abstract

The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoKalpha powder X-ray diffraction data (R (sub F) = 3.69%). Okayamalite exhibits a melilite-type structure, space group P42 (sub 1) m, with cell edges a = 7.1248(2), c = 4.8177(2) Aa. Si and B are ordered on the T1 and T2 sites respectively, in agreement with the refined tetrahedral distances ([T1-O] = 1.657 Aa and [T2-O] = 1.498 Aa). In comparison with the other melilite-type compounds, the cation population in okayamalite leads to the minimum structural misfit between tetrahedral and square-antiprism layers.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 85
Serial Issue: 10
Title: Rietveld refinement of okayamalite, Ca (sub 2) SiB (sub 2) O (sub 7) ; structural evidence for the B/Si ordered distribution
Affiliation: Universita di Firenze, Dipartimento di Scienze della Terra, Florence, Italy
Pages: 1512-1515
Published: 200010
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 27
Accession Number: 2001-002763
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N58°27'00" - N58°27'00", E08°55'60" - E08°55'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200101
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