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Aluminum orthoposphate (AlPO 4 ) has polymorphs isostructural with tridymite, cristobalite, and quartz. Berlinite is the low-temperature form that corresponds to α-quartz. We report berlinite-quartz solid solutions to crystallize from a synthetic P-rich peraluminous granitic melt, similar in composition to the most volatile-rich silicate melt inclusions found in pegmatites. The crystallization took place in experiments performed in cold-seal pressure vessels at 450-700 °C and 0.1-0.2 GPa H 2 O pressure. At these conditions, the berlinite-quartz mutual solubility is limited to 5-7 mol% SiO 2  on the phosphate side of the solvus and to the maximum of 1 mol% AlPO 4  on the silica-rich side. The mutual solubility appears to decrease with falling temperature. At low T the crystals of berlinitequartz solid solutions are strongly zoned and show complex intergrowths between the P-rich and silica-rich phases. They were studied by electron microprobe, transmission electron microscopy, and Raman spectroscopy. In the light of our new experimental results, the extreme P enrichment reported earlier for some natural quartz-hosted melt inclusions may be explained as a post-entrapment contamination by the berlinite-bearing host.

Crystallization of AlPO 4 -SiO 2 solid solutions from granitic melt and implications for P-rich melt inclusions in pegmatitic quartz