Citation: Toraya, H.; Marumo, F. (1983). The crystal structure of a germanate mica K Mg2.5+x Ge4-2x Al2x O10 F2 (x= .14) and distortion of (Ge, Al) O4 tetrahedra. Mineralogical Journal (Japan), 11, pp. 222-231.
Formula: Al0.28 F2 Ge3.72 K Mg2.64 O10
Chemical name: K Mg2.64 Ge3.72 Al.28 O10 F2
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al8 F4 Ge8 Mg6 O20 (Al4 F2 Ge4 Mg3 O10)
Multiplicity: 1