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 HO15
      Locality: El Hoyazo, lavas of the Neogene Volcanic Province of SE Spain
      _database_code_amcsd 0004920

      CELL PARAMETERS:    8.1504   8.1504   8.1504   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    541.423
      Density (g/cm3):      4.114
      MAX. ABS. INTENSITY / VOLUME**2:      37.01859385    
      RIR:      2.930
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.03         57.27        2.8816    2   2   0        12
                36.57        100.00        2.4574    3   1   1        24
                44.46         15.99        2.0376    4   0   0         6
                48.70          3.39        1.8698    3   3   1        24
                55.21         16.46        1.6637    4   2   2        24
                58.88         36.50        1.5685    5   1   1        24
                58.88          3.88        1.5685    3   3   3         8
                64.70         49.28        1.4408    4   4   0        12
                73.48          5.36        1.2887    6   2   0        24
                76.67          9.46        1.2429    5   3   3        24
                81.89          1.60        1.1764    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.