Fayalite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R070293
      Birle J D, Gibbs G V, Moore P B, Smith J V
      American Mineralogist 53 (1968) 807-824
      Crystal structures of natural olivines

      CELL PARAMETERS:   4.824471   10.49586   6.097365   90.00000   90.00000   90.00000
      SPACE GROUP: Pbnm
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.92          8.31        5.2479    0   2   0
                20.28          9.06        4.3836    1   1   0
                22.37          9.24        3.9775    0   2   1
                23.53          4.38        3.7834    1   0   1
                25.04         59.86        3.5592    1   1   1
                25.09          5.43        3.5517    1   2   0
                29.11          3.39        3.0690    1   2   1
                29.31          6.03        3.0487    0   0   2
                31.60         91.73        2.8323    1   3   0
                34.02         32.60        2.6361    0   2   2
                34.18         11.06        2.6240    0   4   0
                34.94         64.92        2.5687    1   3   1
                35.89        100.00        2.5029    1   1   2
                37.28         15.35        2.4122    2   0   0
                37.32         13.40        2.4103    0   4   1
                38.29          6.38        2.3509    2   1   0
                38.94         12.13        2.3133    1   2   2
                39.08         11.60        2.3051    1   4   0
                41.16          6.51        2.1935    2   1   1
                43.62          6.05        2.0750    1   3   2
                43.90          1.63        2.0626    2   2   1
                45.61          2.31        1.9888    0   4   2
                47.22          2.74        1.9249    1   5   0
                49.42         10.53        1.8439    1   1   3
                49.66          6.29        1.8356    1   5   1
                51.34         72.02        1.7796    2   2   2
                51.45         21.79        1.7758    2   4   0
                51.82          2.22        1.7640    1   2   3
                53.76         11.57        1.7050    2   4   1
                54.57         12.38        1.6815    0   6   1
                55.65         15.44        1.6513    1   3   3
                56.53         17.40        1.6276    1   5   2
                57.33          7.17        1.6068    0   4   3
                58.01          4.18        1.5896    3   1   0
                60.17          1.11        1.5375    2   1   3
                60.14          5.70        1.5382    3   1   1
                60.17          1.23        1.5376    3   2   0
                60.30          3.39        1.5345    2   4   2
                60.38          2.37        1.5327    2   5   1
                60.74         20.92        1.5243    0   0   4
                61.06         24.91        1.5173    0   6   2
                62.26          1.13        1.4909    3   2   1
                63.67          6.01        1.4612    3   3   0
                65.13         13.44        1.4318    1   7   0
                65.69          7.61        1.4210    3   3   1
                66.29         10.15        1.4095    3   1   2
                66.93          1.64        1.3976    1   5   3
                67.93          3.25        1.3794    2   6   1
                68.30          6.60        1.3729    3   2   2
                68.40          1.44        1.3711    3   4   0
                70.08         13.28        1.3423    1   3   4
                70.38          2.28        1.3373    2   4   3
                70.35          2.60        1.3377    3   4   1
                71.08          4.70        1.3258    0   6   3
                71.56          2.66        1.3181    0   4   4
                73.46          5.61        1.2886    2   0   4
                73.74          4.92        1.2843    2   6   2
                74.10          1.01        1.2790    2   1   4
                75.97          1.43        1.2521    3   1   3
                76.18          1.48        1.2492    2   5   3
                79.42          4.46        1.2061    4   0   0
                79.50          1.09        1.2051    0   8   2
                80.31          1.17        1.1950    1   5   4
                81.01          3.79        1.1864    3   3   3
                81.75          7.90        1.1775    3   5   2
                81.98          1.17        1.1749    1   1   5
                81.96          1.36        1.1751    2   7   2
                83.09          1.88        1.1619    2   6   3
                83.55          7.09        1.1567    2   4   4
                83.92          2.68        1.1525    2   8   0
                85.36          2.04        1.1367    3   4   3
                85.75          1.98        1.1325    2   8   1
                86.94          3.87        1.1201    1   3   5
                87.41          1.99        1.1152    4   1   2
                88.91          1.66        1.1002    3   1   4
                89.27          5.90        1.0968    4   2   2
                89.28          4.99        1.0967    3   7   0
                89.36          2.64        1.0959    4   4   0
                89.36          2.64        1.0959    4   4   0
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.