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Published online by Cambridge University Press: 14 March 2018
As part of a study of the structure of whitlockite (β-Ca3(PO4)2) attempts were made to prepare single crystals of the mineral synthetically. At 1180° there is a polymorphic transition from the rhombohedral β-form to a high-temperature monoclinie form α-Ca3(PO4)2. The density of the α-form is 12% less than that of the β-form and large crystals were not found to transform without powdering. CaCl2 was therefore added as a flux to see whether crystals of Ca3(PO4)2 could be produced from a melt below 1180°. The melting point of pure Ca3(PO4)2 is about 1800°. In addition to chlorapatite (Ca5(PO4)3C1), a phase of composition Ca2PO4Cl was produced. This compound had been earlier observed by Cameron and McCaughey, who identified the crystals as being closely related to the mineral spodiosite (Ca2PO4F).
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