AM_Brandtite_1 Formula: Mn Ca2 As2 O10 H4 Name: Brandtite Unit cell: 5.65 12.8 5.65 90.0 80.5 90.0 , V=403.00 Space group: P121/C1 (14)

Dahlman B , Arkiv for Mineralogi och Geologi , 1 (1952) p.339-366, The crystal structures of krohnkite, CuNa2(SO4)2*2H2O and brandtite, MnCa2(AsO4)2*2H2O, Locality: Harstigen mine, Sweden