Hercynite
      Lavina B, Cesare B, Alvarez-Valero A M, Uchida H, Downs R T, Koneva A, Dera P
      American Mineralogist 94 (2009) 657-665
      Closure temperatures of intracrystalline ordering in anatectic and metamorphic
      hercynite, Fe2+Al2O4
      Note: Sample AVMa8.9
      Locality: El Hoyazo, lavas of the Neogene Volcanic Province of SE Spain
      _database_code_amcsd 0004918

      CELL PARAMETERS:    8.1511   8.1511   8.1511   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    541.563
      Density (g/cm3):      4.122
      MAX. ABS. INTENSITY / VOLUME**2:      37.54550287    
      RIR:      2.966
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.03         59.74        2.8818    2   2   0        12
                36.56        100.00        2.4576    3   1   1        24
                44.46         14.82        2.0378    4   0   0         6
                48.69          4.06        1.8700    3   3   1        24
                55.21         17.12        1.6638    4   2   2        24
                58.87          3.81        1.5687    3   3   3         8
                58.87         37.11        1.5687    5   1   1        24
                64.69         49.26        1.4409    4   4   0        12
                73.48          5.56        1.2888    6   2   0        24
                76.66          9.56        1.2430    5   3   3        24
                81.88          1.48        1.1765    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.