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Tuite, the high-pressure γ-form of the Ca 3 (PO 4 ) 2  system, has been synthesized from chlorapatite at 15 GPa and 1300 °C using a multi-anvil apparatus. Its crystal structure was determined with single-crystal X‑ray diffraction. It is isostructural with palmierite, with space group R3̅m and unit-cell parameters a = 5.2522(9) and c = 18.690(3) Å. The structure of tuite is characterized by three distinct polyhedra, PO 4 , Ca1O 12 , and Ca2O 10 , that are translationally interconnected in the sequence of PO 4 - Ca2O 10 -Ca1O 12 -Ca2O 10 -PO 4  along the c axis.

A comparison of the Ca 3 (PO 4 ) 2 and CaSiO 3 systems, with a new structure refinement of tuite synthesized at 15 GPa and 1300 °C