AM_Annite_7 Formula: Si2.28 Al2.52 Fe2.312 K.92 O12 Name: Annite Unit cell: 5.3582 9.2819 10.2688 90.0 100.39 90.0 , V=502.34 Space group: C12/M1 (12)

Redhammer G J , Beran A , Schneider J , Amthauer G , Lottermoser W , American Mineralogist , 85 (2000) p.449-465, Spectroscopic and structural properties of synthetic micas on the, annite-siderophyllite binary: Synthesis, crystal structure refinement,, Mossbauer, and infrared spectroscopy, Sample: sd87no.10