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Tuite, γ-Ca 3 (PO 4 ) 2 , is regarded as an important phosphate mineral in the deep mantle playing a crucial role as a host for rare earth elements, large ion lithophile elements, and phosphorus. In this study we report the thermoelastic properties of synthetic γ-Ca 3 (PO 4 ) 2  at simultaneously high pressures and temperatures of up to 35.4 GPa and 1300 K, respectively, as determined by means of in situ energydispersive X‑ray diffraction in a large-volume multi-anvil apparatus. The pressure-volume-temperature data obtained for γ-Ca 3 (PO 4 ) 2  were fitted by the high-temperature Birch-Murnaghan equation of state to yield V 2  = 447.4(4) Å 3 , K T0  = 100.8(18) GPa, K′ T0  = 5.74(13), (∂KT/∂T) P  = -0.020(1) GPa/K, and α T  = 3.26(18) × 10 -5  + 1.76(24) × 10 -8  T. In addition, fitting the present data to the Mie-Grüneisen-Debye equation of state gives γ 0  = 1.35(6), Θ 0  = 944(136) K, and q = 0.37(29). Based on the thermoelastic properties obtained in our study, the density profiles of γ-Ca 3 (PO 4 ) 2  tuite along typical cold and hot slab geotherms were calculated and are compared with those of the coexisting silicate minerals in subducting mid-ocean ridge basalt.

P-V-T relations of γ-Ca 3 (PO 4 ) 2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus