AM_Muscovite-2M1_13 Formula: O11.72 (F.28 Na.14) Rb.02 K.84 Si3.192 Al2.568 Fe.13 Li.13 Mg.01 H1.72 Name: Muscovite-2M1 Unit cell: 5.19 9.022 20.057 90.0 95.6 90.0 , V=934.67 Space group: C12/C1 (15)

Brigatti M F , Kile D E , Poppi M , The Canadian Mineralogist , 39 (2001) p.1171-1180, Crystal structure and crystal chemistry of lithium-bearing muscovite-2M1, O4 B33 is missing a zero, Sample: 2b