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Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite

Published online by Cambridge University Press:  05 July 2018

A. Kasioptas ,
C. Perdikouri ,
C. V. Putnis  and
A. Putnis
A. Kasioptas*
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
C. Perdikouri
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
C. V. Putnis
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
A. Putnis
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
*
*E-mail: [email protected]
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Abstract

During chemical weathering and natural hydrothermal reactions, apatite can form by replacing calcium carbonates. In hydrothermal experiments in which aragonite and calcite single crystals have been reacted with phosphate solutions, the carbonates are replaced by polycrystalline hydroxylapatite (HAP). In both cases the crystals have retained their overall morphology while their compositions have changed significantly. The HAP appears to have a crystallographic relationship to the parent carbonate crystals. The textural relationships are consistent with an interface-coupled dissolution-precipitation mechanism. Structural relationships and relative molar volumes and solubilities appear to be factors that greatly affect replacement reactions.

Keywords

apatitearagonitecalcitepseudomorphismreplacement
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 77 - 80
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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