Okayamalite Giuli G, Bindi L, Bonazzi P American Mineralogist 85 (2000) 1512-1515 Rietveld refinement of okayamalite, Ca2SiB2O7: Structural evidence for the B/Si ordered distribution _database_code_amcsd 0002589 7.1248 7.1248 4.8177 90 90 90 P-42_1m atom x y z Uiso Ca .3384 .1616 .5080 .020 SiT1 0 0 0 .019 BT2 .1408 .3592 .9470 .013 O1 .5 0 .1460 .013 O2 .1424 .3576 .2517 .013 O3 .0782 .1777 .8105 .013