AM_Annite Formula: Al1.282 Si2.808 Fe2.43 Ti.21 Mg.12 Mn.03 K.88 Na.07 Ca.03 O11.73 F.22 Cl.05 H1.38 Name: Annite Unit cell: 5.386 9.3241 10.2683 90.0 100.63 90.0 , V=506.82 Space group: C12/M1 (12)

Hazen R M , Burnham C W , American Mineralogist , 58 (1973) p.889-900, The crystal structures of one-layer phlogopite and annite