AM_Annite_10 Formula: Al1.71 Si2.56 Mg.12 Fe2.37 Mn.03 Ti.03 K O11.96 F.04 H1.9 Name: Annite Unit cell: 5.3741 9.3083 10.2829 90.0 100.22 90.0 , V=506.23 Space group: C12/M1 (12)

Redhammer G J , Roth G , American Mineralogist , 87 (2002) p.1464-1476, Single-crystal structure refinements and crystal chemistry of, synthetic trioctahedral micas KM3(Al,Si)4O10(OH)2, where, M = Ni, Mg, Co, Fe, Al, Sample: G-117