AM_Muscovite-2M1 Formula: (K.99 Na.01) Si3.32 Al2.37 Fe.3 Mn.06 H.3 O11.96 F.04 Name: Muscovite-2M1 Unit cell: 5.226 9.074 20.039 90.0 95.74 90.0 , V=945.50 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 GA1 from a pegmatite on Maddalena Island, Italy