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Mcconnellite, CuCrO2 and ellinaite, CaCr2O4, from varicoloured spurrite marble of the Daba-Siwaqa area, Hatrurim Complex, Jordan

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dc.abstract.enA common attribute of two rare natural chromium-bearing oxides: mcconnellite, CuCrO2, discovered more than 40 years ago in Guyana, and a new mineral ellinaite, CaCr2O4, described from two localities (Brazil and Israel) recently, is that these minerals are poorly studied due to their rarity and small size. Mcconnellite and ellinaite in the present study were found in varicoloured marbles of the pyrometamorphic Hatrurim Complex in the Tulul Al Hammam area, Daba-Siwaqa, Jordan. Structural data obtained for ellinaite (Pnma, a = 9.0875(2), b = 2.9698(1), c = 10.6270(3) Å and V = 286.80(2) Å3), with an empirical formula (Сa1.00Sr0.01)Σ1.01(Cr3+1.79Al0.07Ca0.04Fe3+0.04 Ti4+0.03Mg0.03)Σ2.00O4, is similar to the structural data of synthetic analogue β-CaCr2O4 but differs significantly from the data obtained for ellinaite from Brazil and Israel despite the fact that all the natural phases have a similar composition. Single-crystal X-ray diffraction data for mcconnellite from Jordan (Rm, a = b = 2.9756(1) and c = 17.124(1) Å) with composition (Cu0.98Ca0.03Sr0.01)Σ1.02(Cr3+0.90Al0.05 Fe3+0.03)Σ0.98O2, is the first determination of a natural Cu-delafossite-type structure. This paper also presents the results of a single-crystal Raman study for mcconnellite and ellinaite, which indicates that the spectral features of these minerals is dependent on crystal orientation.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGaluskina, Irina
dc.contributor.authorStachowicz, Marcin
dc.contributor.authorGaluskin, Evgeny
dc.contributor.authorVapnik, Yevgeny
dc.contributor.authorWoźniak, Krzysztof
dc.date.accessioned2024-01-25T05:34:40Z
dc.date.available2024-01-25T05:34:40Z
dc.date.issued2021
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.volume85
dc.identifier.doi10.1180/MGM.2021.27
dc.identifier.issn0026-461X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/111958
dc.identifier.weblinkhttps://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0026461X2100027X
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofMineralogical Magazine
dc.relation.pages387-397
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enmcconnellite
dc.subject.enellinaite
dc.subject.endelafossite
dc.subject.enpost-spinel
dc.subject.enstructure
dc.subject.enRaman
dc.subject.enHatrurim Complex
dc.subject.enJordan
dc.titleMcconnellite, CuCrO2 and ellinaite, CaCr2O4, from varicoloured spurrite marble of the Daba-Siwaqa area, Hatrurim Complex, Jordan
dc.typeJournalArticle
dspace.entity.typePublication