000320868 001__ 320868 000320868 005__ 20250730111848.0 000320868 0247_ $$2doi$$a10.1007/s00710-016-0487-6 000320868 0247_ $$2ISSN$$a0041-3763 000320868 0247_ $$2ISSN$$a0930-0708 000320868 0247_ $$2ISSN$$a1438-1168 000320868 0247_ $$2WOS$$aWOS:000401789200006 000320868 0247_ $$2altmetric$$aaltmetric:15536670 000320868 0247_ $$2openalex$$aopenalex:W2564856850 000320868 037__ $$aPUBDB-2017-02144 000320868 041__ $$aEnglish 000320868 082__ $$a550 000320868 1001_ $$0P:(DE-HGF)0$$aZaitsev, Anatoly N.$$b0$$eCorresponding author 000320868 245__ $$aJörgkellerite, $\mathrm{Na_{3}Mn^{3+}}$$\mathrm{_{3}(PO_{4})}$$\mathrm{_{2}(CO_{3})O_{2}·5H_{2}O}$, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania 000320868 260__ $$aWien [u.a.]$$bSpringer$$c2016 000320868 3367_ $$2DRIVER$$aarticle 000320868 3367_ $$2DataCite$$aOutput Types/Journal article 000320868 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1519136096_12961 000320868 3367_ $$2BibTeX$$aARTICLE 000320868 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000320868 3367_ $$00$$2EndNote$$aJournal Article 000320868 500__ $$a(c) Springer-Verlag Wien; Post referee fulltext in progress; Embargo 12 months from publication 000320868 520__ $$aJörgkellerite, ideally Na$_{3}$Mn$^{3+}$$_{3}$(PO$_{4}$)$_{2}$(CO$_{3}$)O$_{2}$·5H$_{2}$O, is a new layered phosphate-carbonate from the Oldoinyo Lengai volcano in the Gregory Rift (northern Tanzania). The mineral occurs as spherulites, up to 200 μm in diameter, consisting of plates up to 10 μm in thickness in shortite-calcite and calcite carbonatites. Jörgkellerite is brown with a vitreous lustre and has a perfect micaceous cleavage on {001}, Mohs hardness is 3. The calculated density is 2.56 g/cm3. Jörgkellerite is uniaxial (-), ω = 1.700(2), ε = 1.625(2) (Na light, 589 nm) with distinct pleochroism: O = dark brown, E = light brown. The empirical formula of the mineral (average of 10 electron microprobe analyses) is (Na$_{2.46}$K$_{0.28}$Ca$_{0.08}$Sr$_{0.04}$Ba$_{0.02}$)$_{Σ2.88}$(Mn$^{3+}_{2.39}$Fe$^{3+}_{0.56}$)$_{Σ2.95}$((PO$_4$)$_{1.95}$(SiO$_4$)$_{0.05}$))$_{Σ2.00}$(CO$_3$)(O$_{1.84}$(OH)$_{0.16}$)$_{Σ2.00}$·5H$_2$O. The oxidation state of Mn has been determined by XANES. Jörgkellerite is trigonal, space group P-3, a = 11.201(2) Å, c = 10.969(2) Å, V = 1191.9(7) Å$^{3}$ and Z = 3. The five strongest powder-diffraction lines [d in Å, (I/I$_o$), (hkl)] are: 10.970 (100) (001), 5.597 (15) (002), 4.993 (8) (111), 2.796 (14) (220) and 2.724 (20) (004). The crystal structure is built up of the layers composed of disordered edge-sharing [MnO6] octahedra. Each fourth Mn site in octahedral layer is vacant that results in appearance of ordered system of hexagonal “holes” occupied by (CO$_3$) groups. The overall composition of the layer can be expressed as [Mn$_3$O$_8$(CO$_3$)]. These manganese-carbonate layers are linked in the third dimension by (PO$_4$) tetrahedra and Na-polyhedra. 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