AM_Pigeonite_3 Formula: O6 Si2 Mg.926 Fe.834 Mn.027 Ca.195 Name: Pigeonite Unit cell: 9.708 8.941 5.244 90.0 108.52 90.0 , V=431.60 Space group: P121/C1 (14)

Camara F , Carpenter M A , Domeneghetti M C , Tazzoli V , American Mineralogist , 88 (2003) p.1115-1128, Coupling between non-convergent ordering and transition temperature