AM_Muscovite-2M1_6 Formula: (K.88 Na.06 Ca.06) Si3.08 Al2.8 Ti.02 Fe.08 Mg.06 H.28 O11.96 F.04 Name: Muscovite-2M1 Unit cell: 5.188 8.996 20.082 90.0 95.78 90.0 , V=932.49 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 C3-29b from peraluminous granites at Northern Victoria Land, Antarctica