AM_Muscovite-2M1_5 Formula: (K.92 Na.08) Si3.2 Al2.64 Ti.06 Fe.06 Mg.06 H.3 O12 Name: Muscovite-2M1 Unit cell: 5.186 9.005 20.031 90.0 95.78 90.0 , V=930.69 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 CC1b from peraluminous granites at Northern Victoria Land, Antarctica