Muscovite_3 Formula: K Al2.908 Si3.092 O11.88 F.12 H1.83 Name: Muscovite Unit cell: 5.1579 8.95 20.071 90.0 95.75 90.0 , V=921.88 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 Panasqueira, Portugal