AM_Mica Formula: (Si3.312 Fe.688) (Mg2.664 Li.225 Na.111) K O10 F2 Name: Mica Unit cell: 5.329 9.23 10.219 90.0 100.0 90.0 , V=495.00 Space group: C12/M1 (12)

Hazen R M , Finger L W , Velde D , American Mineralogist , 66 (1981) p.586-591, Crystal structure of a silica- and alkali-rich trioctahedral mica