Citation: Moore, P.B.; Araki, T. (1979). Magnussonite, manganese arsenite, a fluorite derivative structure. American Mineralogist, 64, pp. 390-401.
Formula: As6 Cl0.8 Cu0.51 H0.2 Mg0.555 Mn8.885 O18.2
Chemical name: Mn7.935 Mg0.555 Cu0.510 (As6 Mn0.95 O18) Cl0.80 (O H)0.20
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: As96 Cl48 Cu48 Mg120 Mn264 O336 (As4 Cl2 Cu2 Mg5 Mn11 O14)