AM_Annite_8 Formula: Si2.552 Al3.448 Fe3 (K.99 Na.01) O12 Name: Annite Unit cell: 5.377 9.308 10.283 90.0 100.22 90.0 , V=506.49 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: G-117