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 HO27BC
      Locality: El Hoyazo, lavas of the Neogene Volcanic Province of SE Spain
      _database_code_amcsd 0004921

      CELL PARAMETERS:    8.1474   8.1474   8.1474   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    540.825
      Density (g/cm3):      4.100
      MAX. ABS. INTENSITY / VOLUME**2:      36.72095282    
      RIR:      2.916
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.05         58.85        2.8805    2   2   0        12
                36.58        100.00        2.4565    3   1   1        24
                44.48         15.66        2.0368    4   0   0         6
                48.72          3.85        1.8691    3   3   1        24
                55.23         16.87        1.6631    4   2   2        24
                58.90          3.80        1.5680    3   3   3         8
                58.90         37.33        1.5680    5   1   1        24
                64.72         49.96        1.4403    4   4   0        12
                73.52          5.47        1.2882    6   2   0        24
                76.70          9.61        1.2425    5   3   3        24
                81.92          1.59        1.1760    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.