| Reference Type | Journal (article/letter/editorial) |
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| Title | Experimental studies of apatite crystallization in parts of the system CaO-P2O5-H2O at 1000 bars |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Biggar, G. M. | Author |
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| Year | 1966 (December) | Volume | 36 |
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| Issue | 276 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_36/36-276-1110.pdf+ |
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| DOI | doi:10.1180/minmag.1966.036.276.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6020 | Long-form Identifier | mindat:1:5:6020:6 |
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| GUID | 0 |
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| Full Reference | Biggar, G. M. (1966) Experimental studies of apatite crystallization in parts of the system CaO-P2O5-H2O at 1000 bars. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (276) 1110-1122 doi:10.1180/minmag.1966.036.276.06 |
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| Plain Text | Biggar, G. M. (1966) Experimental studies of apatite crystallization in parts of the system CaO-P2O5-H2O at 1000 bars. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (276) 1110-1122 doi:10.1180/minmag.1966.036.276.06 |
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| In | (1966) Mineralogical Magazine Vol. 36 (276) Mineralogical Society |
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| Abstract/Notes | SummarySolid-liquid-vapour phase equilibria for the join Ca(OH)2-Ca3(PO4)2-H2O at 1000 bars are determined in the temperature range 700 to 950°C. The isobaric invariant equilibrium portlandite + hydroxyapatite → liquid on the join Ca(OH)2-Ca3(PO4)2 involves a liquid with the composition 96 wt. % Ca(OH)2, 4 wt. % Ca2(PO4)2 and occurs at 765°C. The isobaric invariant equilibrium portlandite + hydroxyapatite + vapour → liquid on the join Ca(OH)2-Ca3(PO4)2-H2O is encountered at 735°C, and involves a liquid containing 92 wt. % Ca(OH)2, 4 wt. % Ca3(PO4)2, and 4 wt. % H2O. The apatites are shown by X-ray diffraction techniques to vary in composition with changes in the bulk composition from which crystallization occurred.The apatite liquidus is steep; apatite is the first mineral to crystallize from calcium-hydroxide-rich liquids containing as little as 4 wt. % Ca2(PO4)2 (1·8 % P2O5) at temperatures as low as 735°C in the presence of vapour at 1000 bars pressure; and rapid crystal settling of apatite was experimentally noted. These observations suggest that concentrations of apatite in carbonatites are the result of crystal accumulation from liquids relatively poor in P2O5. |
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