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Scheme of growth models in (a) Au-coated pure MgAl2O4 system and (b) Au-MgAl2O4 with Mn added in the tube. The size of circles in the atmosphere represents the relative amount of corresponding gaseous species. In the atomic models of spinel and orthopyroxene, red, cyan, orange, and blue spheres are O, Al, Mg, and Si, respectively.
