AM_Pigeonite_58 Formula: Mg.461 Fe.419 Mn.014 Ca.106 Si O3 Name: Pigeonite Unit cell: 9.801 9.008 5.296 90.0 109.01 90.0 , V=442.07 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: hgd, T = 650 C