% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Zaitsev:320868,
      author       = {Zaitsev, Anatoly N. and Britvin, Sergey and Kearsley, Anton
                      and Wenzel, Thomas and Kirk, Caroline},
      title        = {{J}örgkellerite,
                      $\mathrm{{N}a_{3}{M}n^{3+}}$$\mathrm{_{3}({PO}_{4})}$$\mathrm{_{2}({CO}_{3}){O}_{2}·5{H}_{2}{O}}$,
                      a new layered phosphate-carbonate mineral from the
                      {O}ldoinyo {L}engai volcano, {G}regory rift, northern
                      {T}anzania},
      journal      = {Mineralogy and petrology},
      volume       = {111},
      number       = {3},
      issn         = {1438-1168},
      address      = {Wien [u.a.]},
      publisher    = {Springer},
      reportid     = {PUBDB-2017-02144},
      pages        = {373 – 381},
      year         = {2016},
      note         = {(c) Springer-Verlag Wien; Post referee fulltext in
                      progress; Embargo 12 months from publication},
      abstract     = {Jörgkellerite, ideally
                      Na$_{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. The origin of jörgkellerite is related to
                      low-temperature oxidative alteration of
                      gregoryite-nyerereite carbonatites.},
      cin          = {DOOR},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)D-A1-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000401789200006},
      doi          = {10.1007/s00710-016-0487-6},
      url          = {https://bib-pubdb1.desy.de/record/320868},
}