Citation: Takeuchi, Y. (1966). Structures of brittle micas. Clays and Clay Minerals (-28,1980), 13, pp. 1-25.
Formula: Al4 Ca H2 Mg2 O12 Si
Chemical name: Ca Mg2 Al (Al3 Si O10) (O H)2
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al10 Mg4 O24 Si8 (Al5 Mg2 O12 Si4)
Multiplicity: 1