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Hydroxykenoelsmoreite, the first new mineral from the Republic of Burundi

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We report the new mineral hydroxykenoelsmoreite, which has been approved by the IMA as IMA2016-056. The mineral occurs at the Masaka gold mine, Burundi, as rosettes up to 150μm across of platy crystals up to 20μm wide but <2μm thick, associated with goethite and galena. Crystals are canary yellow, transparent with a vitreous lustre, and have a pale yellow streak. Hydroxykenoelsmoreite is uniaxial (–) and non-pleochroic. The refractive indices were too high to measure, but the Gladstone-Dale compatibility index predicts n ave = 2.065. Crystals are brittle with an irregular fracture, but have perfect cleavage on {0 0 1}. The Mohs hardness is ~3 by analogy with hydrokenoelsmoreite. The mineral is a member of the elsmoreite group of the pyrochlore supergroup, but deviates from the ideal cubic symmetry due mainly to ordering of Fe3+ onto one of two W sites. Its structure is trigonal, space group R 3, with unit-cell parameters a = 7.313(2), c = 17.863(7) Å, V = 827(1) Å3 and Z = 6. The empirical formula (based on 7 (O + OH) per formula unit (pfu)) is: ([] 1.668Pb0.315Ca0.009Na 0.005K0.003Ba0.001)Σ2 (W6+ 1.487Fe3+ 0.357Al0.156)Σ2 (O4.119 (OH)1.881)Σ6 (OH). Raman spectroscopy and bond–valence sums showed that molecular H2O was absent or nearly so. The calculated density is 5.806 g cm–3.
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Keywords: CRYSTAL STRUCTURE; ELSMOREITE; HYDROXYKENOELSMOREITE; PYROCHLORE; TUNGSTATE

Document Type: Research Article

Publication date: June 1, 2017

This article was made available online on January 10, 2017 as a Fast Track article with title: "Hydroxykenoelsmoreite, the first new mineral from the Republic of Burundi".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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