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Phase relationships in the join Ca(OH)2–CaCO3–Ca3(PO4)2–H2O at 1000 bars

Published online by Cambridge University Press:  05 July 2018

G. M. Biggar
G. M. Biggar*
Affiliation:
Grant Institute of Geology, University of Edinburgh
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Summary

Phase equilibria involving calcite, apatite, portlandite, liquid, and vapour were determined at 1000 bars. Calcite, apatite, and portlandite melt at 654 °C to form a liquid of composition (wt %), Ca(OH)2 53 %, CaCO3 46 %, Ca3(PO4)2 1 %. With water present melting occurs at 635 °C to form a similar liquid with a low water content. The X-ray diffraction patterns of the equilibrium apatites were not significantly different from synthetic hydroxyapatite.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 285 , March 1969 , pp. 75 - 82
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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