Cr4 H12 N3 O16 P Averbuch-Pouchot M, Durif A, Guitel J Journal of Solid State Chemistry 36 (1981) 381-384 Crystal structure of an ammonium phospho-chromate: (N H4)3 P Cr4 O16 _cod_database_code 1007244 _database_code_amcsd 0015926 12.033 12.033 10.032 90 90 120 R3m atom x y z Cr1 .8756 -.8756 .5075 Cr2 0 0 0 P1 0 0 .3257 O1 .9312 -.9312 .3646 O2 -.0191 .2269 .5803 O3 .8084 -.8084 .4461 O4 0 0 .1778 O5 .9271 -.9271 .9456 N1 -.5152 .5152 .4676