Citation: Martin-Ramos, J.D.; Rodriguez-Gallego, M. (1982). Chromium mica from Sierra Nevada, Spain. Mineralogical Magazine (1969-), 46, pp. 269-272.
Formula: Al2.12 Ca0.13 Cr0.2 K0.75 Mg0.6 O12 Si3.08
Chemical name: (K0.75 Ca0.13) (Mg0.6 Al1.3 Cr0.2 Fe0.1) (Al0.9 Si3.1 O10) (O H)2
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al12 Cr4 Mg4 O24 Si8 (Al3 Cr Mg O6 Si2)
Multiplicity: 1