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dc.date.accessioned2019-03-26T11:23:21Z
dc.date.available2019-03-26T11:23:21Z
dc.date.created2019-01-17T21:39:49Z
dc.date.issued2018
dc.identifier.citationZeug, M. Nasdala, L. Wanthanachaisaeng, B. Balmer, W.A. Corfu, Fernando Wildner, M. . Blue Zircon from Ratanakiri, Cambodia. Journal of Gemmology. 2018, 36, 112-132
dc.identifier.urihttp://hdl.handle.net/10852/67410
dc.description.abstractZircon from Ratanakiri Province, north-eastern Cambodia, is well known in the gem trade for its vivid blue colour that results from heat treatment. The untreated brown material turns blue under reducing conditions at ~900–1,000°C. Ratanakiri zircon is characterised by remarkably low contents of trace elements. In particular, the actinides have low concentrations (e.g. approximately 120 ppm U and 95 ppm Th). Together with the very young age of the zircon (<1 million years [Ma]), this results in an extremely low self-irradiation dose, which in turn is in agreement with its non-radiation-damaged, nearly perfectly crystalline state. The heat treatment, therefore, does not result in detectable changes in the zircon’s structural state. The cause of the blue colour, presumably related to a valence change upon heating in the reducing environment, is still under debate. The absorption of the treated Ratanakiri zircon is decidedly different from that of blue U4+-doped and blue V4+-doped synthetic ZrSiO4. Absorption spectra show a strongly pleochroic band at 18,200– 13,000 cm–1 (corresponding to ~550–770 nm wavelength) that is clearly responsible for the treated blue colour; however, its assignment remains unresolved.en_US
dc.languageEN
dc.titleBlue Zircon from Ratanakiri, Cambodiaen_US
dc.typeJournal articleen_US
dc.creator.authorZeug, M.
dc.creator.authorNasdala, L.
dc.creator.authorWanthanachaisaeng, B.
dc.creator.authorBalmer, W.A.
dc.creator.authorCorfu, Fernando
dc.creator.authorWildner, M.
cristin.unitcode185,15,22,50
cristin.unitnameSeksjon for geologi og geofysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
dc.identifier.cristin1659800
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Gemmology&rft.volume=36&rft.spage=112&rft.date=2018
dc.identifier.jtitleJournal of Gemmology
dc.identifier.volume36
dc.identifier.startpage112
dc.identifier.endpage132
dc.identifier.doi10.15506/JoG.2018.36.2.112
dc.identifier.urnURN:NBN:no-70587
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn1355-4565
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/67410/1/Zeug_2018_JGe_Ratanakiri-zircon.pdf
dc.type.versionPublishedVersion
dc.relation.projectNFR/223272


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