AM_Annite_12 Formula: K.92 Na.07 Mg1.11 Fe1.35 Ti.18 Al1.34 Si2.72 O12 Name: Annite Unit cell: 5.3216 9.2114 10.106 90.0 99.949 90.0 , V=487.94 Space group: C12/M1 (12)

Laurora A , Brigatti M F , Mottana A , Malferrari D , Caprilli E , American Mineralogist , 92 (2007) p.468-480, Crystal chemistry of trioctahedral micas in alkaline and subalkaline volcanic, rocks: A case study from Mt. Sassetto (Tolfa district, Latium, central Italy), Locality: Mt. Sassetto, Tolfa district, Latium, Italy, Sample: MS8(1), Note: 1M polytype