Ahrensite
      Yamanaka T
      Physics and Chemistry of Minerals 13 (1986) 227-232
      Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of
      temperature and heating duration
      Sample: T = 400 C
      Locality: synthetic
      _database_code_amcsd 0007406

      CELL PARAMETERS:    8.2644   8.2644   8.2644   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    564.461
      Density (g/cm3):      4.795
      MAX. ABS. INTENSITY / VOLUME**2:      59.19597153    
      RIR:      4.020
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.60         30.42        4.7715    1   1   1         8
                30.60         10.97        2.9219    2   2   0        12
                36.04        100.00        2.4918    3   1   1        24
                37.71         12.89        2.3857    2   2   2         8
                43.82         45.31        2.0661    4   0   0         6
                47.98         13.05        1.8960    3   3   1        24
                54.39          3.04        1.6870    4   2   2        24
                57.99          8.61        1.5905    3   3   3         8
                57.99         13.81        1.5905    5   1   1        24
                63.70         40.07        1.4610    4   4   0        12
                66.99          3.59        1.3969    5   3   1        48
                72.31          1.03        1.3067    6   2   0        24
                75.42          6.99        1.2603    5   3   3        24
                76.45          4.96        1.2459    6   2   2        24
                80.52          4.69        1.1929    4   4   4         8
                83.54          1.33        1.1572    7   1   1        24
                88.54          1.37        1.1044    6   4   2        48
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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.