Citation: Martin-Ramos JD; Rodriguez-Gallego M (1982). Chromian mica from Sierra Nevada, Spain Note: y-coordinates of T2 and M1 sites altered. Mineralogical Magazine, 46, pp. 269-272.
Formula: Al2.14 Ca0.13 Cr0.16 Fe0.08 H1.9 K0.69 Mg0.54 Na0.06 O11.9 Si3.08
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al12 Cr4 Fe4 Mg4 O24 Si8 (Al3 Cr Fe Mg O6 Si2)
Multiplicity: 1