Dougal J Ritson et al.
Nature geoscience, 13(5), 344-348 (2020-05-13)
During terrestrial differentiation, the relatively small amount of phosphorus that migrated to the lithosphere was incorporated into igneous rock, predominantly in the form of basic calcium orthophosphate (Ca10(PO4)6(OH,F,Cl)2, apatite). Yet, the highly insoluble nature of calcium apatite presents a significant