Gahnite
      Halenius U, Bosi F
      American Mineralogist 99 (2014) 261-266
      Color of Mn-bearing gahnite: A first example of electronic transitions in heterovalent
      exchange coupled IVMn2+-VIMn3+ pairs in minerals.
      Locality: Kittelgruvan, Nordmark, Varmland, Sweden
      _database_code_amcsd 0020092

      CELL PARAMETERS:    8.1123   8.1123   8.1123   90.000   90.000   90.000
      SPACE GROUP: Fd-3m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    533.866
      Density (g/cm3):      4.176
      MAX. ABS. INTENSITY / VOLUME**2:      39.36650000    
      RIR:      3.070
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.18         60.91        2.8681    2   2   0        12
                36.74        100.00        2.4460    3   1   1        24
                44.68         14.00        2.0281    4   0   0         6
                48.94          4.96        1.8611    3   3   1        24
                55.49         18.66        1.6559    4   2   2        24
                59.18         38.99        1.5612    5   1   1        24
                59.18          3.90        1.5612    3   3   3         8
                65.04         51.93        1.4341    4   4   0        12
                73.89          6.32        1.2827    6   2   0        24
                77.09         10.28        1.2371    5   3   3        24
                82.35          1.42        1.1709    4   4   4         8
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.