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Detection of calcium phosphates in calcium oxalate patinas

Carmen Vazquez-Calvo, Monica Alvarez de Buergo, Rafael Fort and Asuncion de los Rios
Detection of calcium phosphates in calcium oxalate patinas
European Journal of Mineralogy (October 2012) 24 (6): 1031-1045


Calcium oxalate patinas have been studied on historical monuments for years. In some cases they are associated with calcium phosphate, the presence of which has received contrasted attention and may have been overlooked with the characterisation techniques used. This study addresses the state of the art, the most suitable characterisation techniques for identifying calcium phosphate - the most effective and reliable being SEM-EDS of thin sections - and the shortcomings of other methods such as XRD, FT-IR or optical microscopy. It also describes examples of the presence of calcium phosphate analysed in patinas on Spanish monuments. Calcium phosphates were found to appear in these patinas in different ways and shapes: in small aggregates, in a layer mixed with other patina components, as a uniform layer, or constituting a layer with filaments, or forming a porous layer with a sponge-like texture. These findings add new data for the debate about the origin of calcium oxalate patina. Moreover, a comparison of these with other findings is the basis for a proposal of a new denomination for such patinas.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 24
Serial Issue: 6
Title: Detection of calcium phosphates in calcium oxalate patinas
Affiliation: Universidad Complutense de Madrid, Instituto de Geociencias, Madrid, Spain
Pages: 1031-1045
Published: 201210
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 61
Accession Number: 2013-002488
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
Secondary Affiliation: Spanish Natural Sciences Museum, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201302
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