AM_Pigeonite_61 Formula: (Mg.468 Fe.411 Mn.014 Ca.107) Si O3 Name: Pigeonite Unit cell: 9.849 9.018 5.323 90.0 109.44 90.0 , V=445.83 Space group: C12/C1 (15)

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: hgj, T = 950 C