AM_Muscovite_4 Formula: K Al2.908 Si3.092 O11.88 (F.12 H1.88) Name: Muscovite Unit cell: 5.182 8.993 20.232 90.0 95.75 90.0 , V=938.10 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 = 525 deg C, from Panasqueira, Portugal