AM_Muscovite-2M1_4 Formula: (K.96 Na.04) Si3.08 Al2.68 Fe.3 O11.96 F.04 Name: Muscovite-2M1 Unit cell: 5.209 9.035 20.066 90.0 95.68 90.0 , V=939.74 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 H87b from peraluminous granites at Sardinia, Italy