Citation: Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989). Geigerite, the Mn analogue of chudobaite: Its description and crystal structure. American Mineralogist, 74, pp. 676-684.
Formula: As4 H22 Mn5 O26
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: As4 H18 Mn5 O24 (As4 H18 Mn5 O24)
Multiplicity: 1