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The formation enthalpy, -3752.3 ± 4.7 kJomol-', of Hf-zirconolite, CaHfTi 2 0 7 , was obtained using high temperature oxide-melt solution calorimetry. Combined with heat capacity data obtained using low temperature adiabatic calorimetry we report the heat capacity (Cp) and the standard molar formation energetics (AH.E .... t, ASO, and AG6, elements) for Hf-zirconolite from T = 298.15 K to T = 1500 K. Comparison of Hf-zirconolite with Zr-zirconolite is made.