AM_Biotite_11 Formula: Fe Mg2 K (Al Si3) O12 H2 Name: Biotite Unit cell: 5.337 9.242 10.211 90.0 100.15 90.0 , V=495.77 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 M62 from a rock transitional between granitic and monzonitic in, the Valle del Cervo pluton