Citation: Smolyar, B.B.; Drits, V.A.; Kashaev, A.A.; Rozhdestvenskaya, I.V. (1989). Crystal structure of manganese-containing phengite 2M1. Kristallografiya, 34, pp. 621-627.
Formula: Al1.73 Fe0.09 H2 K Mg0.53 Mn0.08 O12 Si3.54 Ti0.03
Chemical name: K (Al1.27 Mg.53 Fe.09 Mn.08 Ti.03) (Al.46 Si3.54) O10 (O H)2
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al12 Fe4 H4 Mg4 Mn4 O24 Si8 Ti4 (Al3 Fe H Mg Mn O6 Si2 Ti)
Multiplicity: 1