AM_Pigeonite_7 Formula: O6 Si2 Mg.942 Fe.834 Mn.027 Ca.18 Name: Pigeonite Unit cell: 9.718 8.951 5.25 90.0 108.5 90.0 , V=433.08 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