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We report the first atomistic computer simulations of the partitioning of divalent cations between forsterite (Mg 2 SiO 4 ) and coexisting MgSiO 3  melt at ~1600 °C and atmospheric pressure. Our results, using new Monte Carlo techniques, are compared with new experimental determinations of forsteritemelt partitioning for the same elements (Ca, Mn, Ni, Co, Cu, Zn, Sr, Cd, Ba) in the same system under identical conditions. Over seven orders-of-magnitude variation in the Nernst partition coefficient (D), experiment and simulation agree typically within a factor of 2 and at worst to within a factor of 4.2 (D Sr ). Our simulation techniques therefore herald a novel means of determining crystalmelt partitioning that may be especially valuable under extreme conditions of pressure and temperature not readily amenable to experimentation.

Letters. Computer simulation of high-temperature, forsterite-melt partitioning