To better understand the role and extent of inter-mineral diffusion during subsolidus processes, we investigated iron magnesium isotopic compositions olivine, orthopyroxene, chromite separates from Peridotite Zone Stillwater Complex. Olivine orthopyroxene show limited Mg variations, with ?26Mg values ranging ?0.40 to ?0.26‰ ?0.29 ?0.22‰, respectively. In contrast, displays extremely large ?0.05...