The solid-melt equilibria of the system CaF2–CaMgSi2O6 (fluorite–diopside) have been studied at atmospheric pressure, using a modified quenching method. This system is characterized by a simple binary eutectic at CaF2 43.5, CaMgSi2O6 56.5 weight percent at 1082 ± 2 °C; neither solid solution nor intermediate compound was found. Certain of the skarns containing fluorite, diopside, and calcite in the Grenville Province of the Canadian Precambrian Shield are considered to have formed by differential melting of impure limestones in regional metamorphic terrains.

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