Calcium phosphates are important carriers of phosphorus, halogens and incompatible trace elements in Earth's crust and mantle. The high-pressure phase Tuite is stable up to at least 25 GPa (and thus up to a depth of at least 700 km) and 1700 °C. Beyond the stability limit of majorite garnet, Tuite is therefore the most important crystalline phosphorus carrier in the upper part of the lower Earth's mantle (Pausch et al. 2024).
