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    Forming Cohesive Calcium Oxalate Layers on Marble Surfaces for Stone Conservation

    Access Status
    Fulltext not available
    Authors
    King, H.
    Mattner, D.
    Plumper, O.
    Geisler, T.
    Putnis, Andrew
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    King, H. and Mattner, D. and Plumper, O. and Geisler, T. and Putnis, A. 2014. Forming Cohesive Calcium Oxalate Layers on Marble Surfaces for Stone Conservation. Crystal Growth and Design. 14: pp. 3910-3917.
    Source Title
    Crystal Growth and Design
    DOI
    10.1021/cg500495a
    ISSN
    15287483
    URI
    http://hdl.handle.net/20.500.11937/45191
    Collection
    • Curtin Research Publications
    Abstract

    Batch experiments were conducted with Carrara marble cubes to examine the replacement of calciteby calcium oxalate, a proposed method of protection for marble used as building stone. Coherent oxalate coatings formed on the marble surface during reactions with >10 mM oxalic acid. The replacement rim contained an inner layer that remained attached to the marble surface and was composed of submicron-sized, rounded grains of calcium oxalate with minimal interconnected porosity, although open fluid pathways (inherited grain boundaries from the underlying marble) were present. In contrast, the outer rim comprises large, individual crystals and is easily removed. Raman spectroscopyidentified the mineral in both layers as whewellite (CaC2O4·H2O). Raman mapping revealed that the rims have zones of different crystallographic orientations contributing to the friability of the outer layer. Mapping of 18O incorporation into the replacement rim indicates that the outer layer formed from the inner layer via a fluid-mediated dissolution-reprecipitation mechanism. This suggests that the textures of precipitated oxalates could be tailored to different marble protection applications through changes insolution chemistry.

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