AM_Muscovite_11 Formula: K.88 Na.11 Al2.84 Fe.06 Mg.02 Si3.08 O12 H2 Name: Muscovite Unit cell: 5.191 9.006 20.068 90.0 95.77 90.0 , V=933.43 Space group: C12/C1 (15)

Catti M , Ferraris G , Ivaldi G , European Journal of Mineralogy , 1 (1989) p.625-632, Thermal strain analysis in the crystal structure of muscovite at 700 C, T = 25 C