AM_Biotite_8 Formula: Fe Mg2 K (Al Si3) O12 H2 Name: Biotite Unit cell: 5.346 9.252 10.238 90.0 100.02 90.0 , V=498.66 Space group: C12/M1 (12)

Brigatti M F , Davoli P , American Mineralogist , 75 (1990) p.305-313, Crystal-structure refinement of 1M plutonic biotites, sample M32 from a syenite in the Valle del Cervo pluton