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The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoKα powder X-ray diffraction data (R F  = 3.69%). Okayamalite exhibits a melilite-type structure, space group P4̅21m, 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 (&lt;T1-O&gt; = 1.657 Å and &lt;T2-O&gt;= 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.

Rietveld refinement of okayamalite, Ca 2 SiB 2 O 7 : Structural evidence for the B/Si ordered distribution