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1 results

  • Ludwigite from central Sweden: new data and crystal structure refinement

  • P. W. U. Appel, M. F. Brigatti
  • Journal:
    Mineralogical Magazine / Volume 63 / Issue 4 / August 1999
    Published online by Cambridge University Press:
    05 July 2018, pp. 511-518

  • Ludwigite from B-bearing iron ores in the Bergslagen area of central Sweden and in the coastal area north of Stockholm has been studied using chemical and single-crystal diffraction techniques. Structure refinements, completed for three crystals showing slightly different Al contents, in the space group Pbam (agreement factor: 2.42 ≤ R ≤ 2.79) indicate that: (1) octahedral M1, M2 and M3 bond distances are similar, although the calculated site population suggests that M1 and M2 are nearly completely occupied by Mg whereas M3 also contains Fe2+ and Fe3+; (2) in the M4 octahedron Fe3+ and Al dominate over Mg (and Fe2+); and (3) the distortion parameter, BLD, indicates that M3 is the most regular, whereas M4 is the most distorted octahedron.