AM_Pigeonite_57 Formula: (Mg.463 Fe.416 Mn.014 Ca.107) Si O3 Name: Pigeonite Unit cell: 9.719 8.947 5.251 90.0 108.49 90.0 , V=433.03 Space group: P121/C1 (14)

Camara F , Carpenter M A , Domeneghetti M C , Tazzoli V , Physics and Chemistry of Minerals , 29 (2002) p.331-340, Non-convergent ordering and displacive phase transition in pigeonite:, in situ HT XRD study, Sample: hga, T = 25 C