AM_Muscovite-2M1_1 Formula: (K.92 Na.08) Si3.2 Al2.65 Ti.04 Fe.12 Mg.06 O12 Name: Muscovite-2M1 Unit cell: 5.182 8.982 20.002 90.0 95.72 90.0 , V=926.35 Space group: C12/C1 (15)

Brigatti M F , Frigieri P , Poppi L , American Mineralogist , 83 (1998) p.775-785, Crystal chemistry of Mg-, Fe-bearing muscovites-2M1, Sample RA1 from a pegmatite on Antarctica