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American Mineralogist; October 2000; v. 85; no. 10; p. 1512-1515
© 2000 Mineralogical Society of America
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Rietveld refinement of okayamalite, Ca2SiB2O7: Structural evidence for the B/Si ordered distribution

G. Giuli*, L. Bindi and P. Bonazzi{dagger}

Dipartimento di Scienze della Terra, Via La Pira 4, I-50121 Firenze, Italy

Correspondence: {dagger} E-mail: pbcry{at}steno.geo.unifi.it

The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoK{alpha} powder X-ray diffraction data (RF = 3.69%). Okayamalite exhibits a melilite-type structure, space group PFormula21m, with cell edges a = 7.1248(2), c = 4.8177(2) Å. Si and B are ordered on the T1 and T2 sites respectively, in agreement with the refined tetrahedral distances (<T1-O> = 1.657 Å and <T2-O>= 1.498 Å). 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.




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