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    Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite

    Access Status
    Fulltext not available
    Authors
    Kasioptas, A.
    Perdikouri, C.
    Putnis, Christine
    Putnis, Andrew
    Date
    2008
    Type
    Conference Paper
    
    Metadata
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    Citation
    Kasioptas, A. and Perdikouri, C. and Putnis, C. and Putnis, A. 2008. Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite, pp. 77-80.
    Source Title
    Mineralogical Magazine
    DOI
    10.1180/minmag.2008.072.1.77
    ISSN
    0026-461X
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/14216
    Collection
    • Curtin Research Publications
    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. © 2008 The Mineralogical Society.

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