AM_Betpakdalite
Formula: Mo8 As2 Fe3 Mg Ca2 O60 H73
Name: Betpakdalite
Unit cell: 19.531 11.061 15.257 90.0 131.57 90.0 , V=2465.89
Space group: C12/M1 (12)

Cooper M A , Hawthorne F C , The Canadian Mineralogist , 37 (1999) p.61-66, The crystal structure of betpakdalite, and a new chemical formula:, {Mg(H2O)6}Ca2(H2O)13[Mo8As2Fe3O36(OH)](H2O)4