AM_Muscovite-2M1_17 Formula: K.69 Na.06 Ca.13 Al2.14 Cr.16 Mg.54 Fe.08 Si3.08 O11.9 H1.9 Name: Muscovite-2M1 Unit cell: 5.2116 9.045 19.97 90.0 95.7 90.0 , V=936.71 Space group: C12/C1 (15)

Martin-Ramos JD , Rodriguez-Gallego M , Mineralogical Magazine , 46 (1982) p.269-272, Chromian mica from Sierra Nevada, Spain, Note: y-coordinates of T2 and M1 sites altered, Locality: Sierra Nevada, Spain