AM_Ercitite Formula: Na.89 Ca.04 Mn.6 Fe.43 Al.01 P O7 H5 Name: Ercitite Unit cell: 6.2499 8.7479 19.9554 90.0 90.0 90.0 , V=1091.03 Space group: CMCA (64)

Cooper M A , Hawthorne F C , Cerny P , The Canadian Mineralogist , 47 (2009) p.173-180, The crystal structure of ercitite, Na2(H2O)4[Mn3+2(OH)2(PO4)2],, and its relation to bermanite, Mn2+(H2O)4[Mn3+2(OH)2(PO4)2], Locality: Tanco granitic pegmatite, Bernic Lake, southeastern Manitoba, Canada