Wadsleyite
      Diffraction data computed using the structure from the paper listed below, 
      along with the cell parameters refined from single crystal data of R090004
      Horiuchi H, Sawamoto H
      American Mineralogist 66 (1981) 568-575
      Beta-Mg2SiO4: Single-crystal X-ray diffraction study
      case 1

      CELL PARAMETERS:   5.6949 11.4500  8.2560   90.000   90.000   90.000
      SPACE GROUP: Imma      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Mg     0.00000   0.00000   0.00000     1.000     0.455
            Mg     0.00000   0.25000   0.97010     1.000     0.409
            Mg     0.25000   0.12760   0.25000     1.000     0.424
            Si     0.00000   0.11980   0.61680     1.000     0.212
            O      0.00000   0.25000   0.21660     1.000     0.375
            O      0.00000   0.25000   0.71640     1.000     0.283
            O      0.00000   0.99000   0.25580     1.000     0.330
            O      0.26150   0.12250   0.99250     1.000     0.335

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  5 +/- 10 +/-  7
            MAX. ABS. INTENSITY / VOLUME**2:      8.631056282    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                27.81         43.28        3.2084    1   1   2
                31.25         13.15        2.8625    0   4   0
                31.42         13.11        2.8475    2   0   0
                33.49         48.27        2.6758    0   1   3
                34.22         55.61        2.6204    2   1   1
                35.71         17.69        2.5144    1   3   2
                36.25         32.75        2.4779    1   0   3
                36.79         91.27        2.4430    1   4   1
                38.26          4.20        2.3523    0   4   2
                38.40          1.65        2.3439    2   0   2
                40.41         12.13        2.2322    0   3   3
                40.90          3.15        2.2067    0   5   1
                41.03         28.13        2.1998    2   3   1
                43.86         33.78        2.0640    0   0   4
                44.90         75.94        2.0188    2   4   0
                47.53          4.57        1.9132    1   1   4
                48.17          3.87        1.8891    1   5   2
                48.60          1.94        1.8735    1   4   3
                51.95          7.58        1.7603    0   5   3
                52.06          1.90        1.7568    2   3   3
                52.46          6.96        1.7442    2   5   1
                52.93          7.36        1.7298    1   3   4
                53.75          5.06        1.7054    3   1   2
                54.84          2.23        1.6742    0   4   4
                54.94          7.26        1.6711    2   0   4
                58.17          7.82        1.5859    1   0   5
                58.75          4.06        1.5717    3   3   2
                59.12         10.28        1.5626    3   0   3
                59.49         14.16        1.5538    3   4   1
                61.16          3.97        1.5155    0   3   5
                62.76          3.86        1.4804    1   5   4
                63.30          4.51        1.4692    1   7   2
                64.58        100.00        1.4432    2   4   4
                65.18         27.00        1.4312    0   8   0
                65.57         27.22        1.4237    4   0   0
                65.90          1.38        1.4174    2   1   5
                66.50          7.84        1.4061    0   7   3
                66.94          4.77        1.3979    2   7   1
                67.54          1.29        1.3869    3   1   4
                68.05          1.40        1.3777    3   5   2
                70.28          3.64        1.3393    0   5   5
                70.94          1.60        1.3285    1   1   6
                71.97          2.17        1.3121    3   3   4
                74.15          1.66        1.2788    2   8   0
                74.42          1.75        1.2748    4   4   0
                75.29          1.89        1.2622    1   3   6
                75.67          7.22        1.2569    4   1   3
                76.46          4.52        1.2458    3   0   5
                76.93          5.90        1.2394    1   8   3
                79.92          2.85        1.2004    4   3   3
                80.53          1.45        1.1927    3   5   4
                81.02          2.05        1.1868    3   7   2
                81.91          5.41        1.1761    0   8   4
                82.27          5.30        1.1720    4   0   4
                83.76          1.66        1.1548    0   9   3
                84.17          4.08        1.1502    2   9   1
                88.09          1.11        1.1089    3   1   6
                88.28          2.68        1.1070    4   5   3
                89.72          1.18        1.0929    5   1   2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.