AM_Biotite_7 Formula: Fe Mg2 K (Al Si3) O12 H2 Name: Biotite Unit cell: 5.343 9.258 10.227 90.0 100.26 90.0 , V=497.79 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 M14 from a monzonite in the Valle del Cervo pluton