Citation: Stimpfl, M. (2005). The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene Sample: quenched from 806 deg C ORD. American Mineralogist, 90, pp. 155-161.