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Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru

Emmanuel Fritsch, Eloise Gaillou, Mikhail Ostroumov, Benjamin Rondeau, Bertrand Devouard and Alain Barreau
Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru
European Journal of Mineralogy (October 2004) 16 (5): 743-752

Abstract

Translucent pink opals from Mexico (Mapimi and Michoacan states) and Peru (Acari area, near Arequipa) are opal-CT, containing 10-40% palygorskite, as demonstrated by XRD, IR and specific gravity measurements. They have an unusual nanostructure, with bunches of fibres 20-30 nm in minimum diameter, related to the fibrous nature of the palygorskite crystals, as seen by electron microscopy. A complex absorption centred at about 500 nm is the cause of the pink colour. It is suggested that the absorption is due to quinone fossil products associated with the phyllosilicate fibres.The Raman spectrum of monoclinic palygorskite is deduced from that of its mixture with opal The opal-CT-palygorskite-quinone association is a geological marker for a specific environment, presumably a fossil lake environment in a volcanic region.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 16
Serial Issue: 5
Title: Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru
Affiliation: Institut des Materiaux Jean Rouxel, Laboratoire de Physique Cristalline and Centre de Microcaracterisation, Nantes, France
Pages: 743-752
Published: 200410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 60
Accession Number: 2004-084037
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N25°51'00" - N25°51'00", W103°49'60" - W103°49'60"
N17°58'00" - N20°25'00", W103°46'60" - W100°15'00"
Secondary Affiliation: Universite Joseph Fourier, FRA, FranceUniversidad de Michoacan de San Nicolas de Hidalgo, MEX, MexicoMuseum National d'Histoire Naturelle, MEX, MexicoUniversite Blaise Pascal, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200424
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