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 = 600 C
      Locality: synthetic
      _database_code_amcsd 0007407

      CELL PARAMETERS:    8.3114   8.3114   8.3114   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    574.146
      Density (g/cm3):      4.714
      MAX. ABS. INTENSITY / VOLUME**2:      56.16034103    
      RIR:      3.879
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.49         31.01        4.7986    1   1   1         8
                30.42         11.06        2.9385    2   2   0        12
                35.83        100.00        2.5060    3   1   1        24
                37.48         12.99        2.3993    2   2   2         8
                43.56         44.53        2.0779    4   0   0         6
                47.70         12.82        1.9068    3   3   1        24
                54.05          2.89        1.6966    4   2   2        24
                57.63          8.20        1.5995    3   3   3         8
                57.63         13.14        1.5995    5   1   1        24
                63.30         37.33        1.4693    4   4   0        12
                66.56          3.39        1.4049    5   3   1        48
                74.92          6.31        1.2675    5   3   3        24
                75.94          4.61        1.2530    6   2   2        24
                79.98          4.15        1.1996    4   4   4         8
                82.97          1.19        1.1638    7   1   1        24
                87.91          1.16        1.1107    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.