AM_Biotite_9 Formula: Fe Mg2 K (Al Si3) O12 Name: Biotite Unit cell: 5.355 9.251 10.246 90.0 100.15 90.0 , V=499.63 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 M13 from a granite in the Valle del Cervo pluton