Martignago F , Andreozzi G B , Dal Negro A , American Mineralogist , 91 (2006) p.306-312, Thermodynamics and kinetics of cation ordering in natural and synthetic, Mg(Al,Fe3+)2O4 spinels from in situ high-temperature X-ray diffraction, Locality: Shishimsk Mountains, Urals, Russia, Sample: 3dis, T = 550 C