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Heat capacity ( C P  ) data of Al-F-bearing titanite are presented that yield the standard entropyS    298.15    ∘$\begin{array}{} {\text S}_{298.15}^{\circ} \end{array} $    of F-Al-titanite CaAlFSiO 4  (FAT).  C P   of synthetic FAT was measured with relaxation calorimetry and differential scanning calorimetry between 5 and 764 K. The results constrainS   298.15    ∘$\begin{array}{} S_{298.15}^{\circ} \end{array} $    to be 115.4 ± 2.0 J/(mol·K) and subsequently the standard Gibbs free energy of formation from the elements, Δ f  G °, of CaAlSiO 4 F to be between –2583 ± 3.0 and –2588 ± 3.0 kJ/mol, and the standard enthalpy of formation from the elements, Δ f  H °, to lie between –2728 ± 3.0 and –2733 ± 3.0 kJ/mol depending on the thermodynamic data retrieval approach. These data, in turn, can be used to quantitatively model high-grade and UHP fluid-rock interaction. The calculation of future petrogenetic grids involving F-bearing minerals and titanite solid solutions in the system CaTiSiO 4 O–CaAlSiO 4 F will only be possible by expanding existing internally consistent thermodynamic databases to the F-system.

Heat capacity measurements of CaAlSiO 4 F from 5 to 850 K and its standard entropy