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1 results

  • Nomenclature of the magnetoplumbite group

  • Dan Holtstam, Ulf Hålenius
  • Journal:
    Mineralogical Magazine / Volume 84 / Issue 3 / June 2020
    Published online by Cambridge University Press:
    26 March 2020, pp. 376-380
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  • A nomenclature and classification scheme has been approved by IMA–CNMNC for the magnetoplumbite group, with the general formula A[B12]O19. The classification on the highest hierarchical level is decided by the dominant metal at the 12-coordinated A sites, at present leading to the magnetoplumbite (A = Pb), hawthorneite (A = Ba) and hibonite (A = Ca) subgroups. Two species remain ungrouped. Most cations, with valences from 2+ to 5+, show a strong order over the five crystallographic B sites present in the crystal structure, which forms the basis for the definition of different mineral species. A new mineral name, chihuahuaite, is introduced and replaces hibonite-(Fe).