Bearthite, Ca2Al(PO4)2OH: stability, thermodynamic …

Abstract. The new phosphate bearthite, Ca 2 Al(PO 4) 2 HO, found in high-pressure metamorphic rocks, has been synthesized from a stoichiometric mixture of γ-Al 2 O 3 and CaHPO 4 ·2H 2 O between 4 kbar water pressure, 485°C and 24.5 kbar, 800°C. Its upper temperature stability limit, bearthite ⇆ hydroxyapatite + corundum + berlinite + H 2 O, has been tightly reversed between 485°C, 1 ...

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