AM_Muscovite_2
Formula: (K.93 Na.07) Al2.73 Fe.16 Si3.1 O11.83 (F.17 H1.83)
Name: Muscovite
Unit cell: 5.215 9.053 20.15 90.0 95.72 90.0 , V=946.57
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 = 300 deg C, from Diamond mine, Keystone, South Dakota