Schiavinatoite Demartin F, Diella V, Gramaccioli C M, Pezzotta F European Journal of Mineralogy 13 (2001) 159-165 Schiavinatoite, (Nb,Ta)BO4, the Nb analogue of behierite _database_code_amcsd 0006854 6.219 6.219 5.487 90 90 90 I4_1/amd atom x y z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) NbM 0 0 0 .52 .257 .00328 .00328 .00322 0 0 0 TaM 0 0 0 .48 .257 .00328 .00328 .00322 0 0 0 B 0 0 .5 .44 .006 .006 .006 0 0 0 O 0 .1792 .3239 .38 .0075 .0026 .0041 0 0 .0004