AM_Pigeonite_60 Formula: (Mg.462 Fe.417 Mn.014 Ca.107) Si O3 Name: Pigeonite Unit cell: 9.84 9.021 5.3184 90.0 109.35 90.0 , V=445.43 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: hgi, T = 850 C