AM_Protoenstatite_2 Formula: Mg Si O3 Name: Protoenstatite Unit cell: 9.315 8.899 5.365 90.0 90.0 90.0 , V=444.73 Space group: PBCN (60)

Yang H , Ghose S , Physics and Chemistry of Minerals , 22 (1995) p.300-310, High temperature single crystal X-ray diffraction studies, of the ortho-proto phase transition in enstatite, Mg2Si2O6 at 1360 K, Sample: T = 1400 K