AM_Muscovite_1 Formula: (K.93 Na.07) Al2.73 Fe.16 Si3.1 O11.83 (F.17 H1.83) Name: Muscovite Unit cell: 5.2 9.021 20.07 90.0 95.71 90.0 , V=936.80 Space group: C12/C1 (15)

Guggenheim S , Chang Y H , Koster van Groos A F , American Mineralogist , 72 (1987) p.537-550, Muscovite dehydroxylation: High-temperature studies, Sample: T = 20 deg C, from Diamond mine, Keystone, South Dakota