Citation: Cooper, M. A.; Hawthorne, F. C.; Cerny, P. (2009). 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. The Canadian Mineralogist, 47, pp. 173-180.
Formula: Al0.01 Ca0.04 Fe0.43 H5 Mn0.6 Na0.89 O7 P