Ringwoodite
      Hazen R M, Downs R T, Finger L W
      American Mineralogist 78 (1993) 1320-1323
      Crystal chemistry of ferromagnesian silicate spinels: Evidence for Mg-Si
      disorder
      Sample: SUNY 1102
      _database_code_amcsd 0001627

      CELL PARAMETERS:    8.2059   8.2059   8.2059   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    552.559
      Density (g/cm3):      4.568
      MAX. ABS. INTENSITY / VOLUME**2:      53.49528924    
      RIR:      3.813
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.73         22.15        4.7377    1   1   1         8
                30.82         12.90        2.9012    2   2   0        12
                36.31        100.00        2.4742    3   1   1        24
                37.98          8.30        2.3688    2   2   2         8
                44.15         46.59        2.0515    4   0   0         6
                48.35         11.42        1.8826    3   3   1        24
                54.81          4.03        1.6750    4   2   2        24
                58.44          9.53        1.5792    3   3   3         8
                58.44         15.40        1.5792    5   1   1        24
                64.21         48.17        1.4506    4   4   0        12
                67.53          3.21        1.3871    5   3   1        48
                72.91          1.54        1.2975    6   2   0        24
                76.06          8.65        1.2514    5   3   3        24
                77.10          4.55        1.2371    6   2   2        24
                81.22          5.85        1.1844    4   4   4         8
                84.28          1.40        1.1491    7   1   1        24
                89.34          2.18        1.0966    6   4   2        48
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.