The central silicate inclusions in chromite observed by McDonald (ibid., v. 60, p. 1674-1685, 1965) in Bushveld have parallels in Stillwater chromite. They are not related to amount of overgrowth on settled chromite, as required by McDonald's hypothesis. Published phase-equilibrium studies do not suggest that a liquid rich in Cr 2 O 3 would separate from basaltic liquid, particularly within the range of crystallization temperatures of basalt.

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