AM_Muscovite-2M1_3 Formula: (K.92 Na.08) Si3.04 Al2.83 Ti.02 Fe.06 Mg.08 H.32 O12 Name: Muscovite-2M1 Unit cell: 5.192 9.013 20.056 90.0 95.83 90.0 , V=933.68 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 GFS15Ab from peraluminous granites at Sardinia, Italy