Fayalite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R070374
      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:   4.823326   10.49594   6.096585   90.00000   90.00000   90.00000
      SPACE GROUP: Pbnm
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.94          8.31        5.2480    0   2   0
                20.30          9.06        4.3827    1   1   0
                22.39          9.24        3.9774    0   2   1
                23.56          4.38        3.7827    1   0   1
                25.06         59.86        3.5586    1   1   1
                25.11          5.43        3.5513    1   2   0
                29.13          3.39        3.0686    1   2   1
                29.33          6.03        3.0483    0   0   2
                31.62         91.73        2.8321    1   3   0
                34.04         32.60        2.6359    0   2   2
                34.20         11.06        2.6240    0   4   0
                34.96         64.92        2.5685    1   3   1
                35.91        100.00        2.5025    1   1   2
                37.31         15.35        2.4117    2   0   0
                37.33         13.40        2.4102    0   4   1
                38.32          6.38        2.3504    2   1   0
                38.96         12.13        2.3130    1   2   2
                39.10         11.60        2.3050    1   4   0
                41.18          6.51        2.1931    2   1   1
                43.64          6.05        2.0748    1   3   2
                43.92          1.63        2.0622    2   2   1
                45.64          2.31        1.9887    0   4   2
                47.24          2.74        1.9248    1   5   0
                49.45         10.53        1.8436    1   1   3
                49.68          6.29        1.8355    1   5   1
                51.36         72.02        1.7793    2   2   2
                51.48         21.79        1.7756    2   4   0
                51.85          2.22        1.7638    1   2   3
                53.78         11.57        1.7048    2   4   1
                54.59         12.38        1.6815    0   6   1
                55.68         15.44        1.6511    1   3   3
                56.55         17.40        1.6275    1   5   2
                57.35          7.17        1.6067    0   4   3
                58.04          4.18        1.5892    3   1   0
                60.20          1.11        1.5373    2   1   3
                60.17          5.70        1.5378    3   1   1
                60.20          1.23        1.5373    3   2   0
                60.33          3.39        1.5343    2   4   2
                60.40          2.37        1.5325    2   5   1
                60.77         20.92        1.5241    0   0   4
                61.08         24.91        1.5172    0   6   2
                62.29          1.13        1.4906    3   2   1
                63.70          6.01        1.4609    3   3   0
                65.15         13.44        1.4318    1   7   0
                65.72          7.61        1.4207    3   3   1
                66.33         10.15        1.4092    3   1   2
                66.96          1.64        1.3975    1   5   3
                67.96          3.25        1.3793    2   6   1
                68.33          6.60        1.3726    3   2   2
                68.43          1.44        1.3709    3   4   0
                70.11         13.28        1.3421    1   3   4
                70.41          2.28        1.3371    2   4   3
                70.38          2.60        1.3375    3   4   1
                71.10          4.70        1.3258    0   6   3
                71.59          2.66        1.3179    0   4   4
                73.49          5.61        1.2884    2   0   4
                73.77          4.92        1.2842    2   6   2
                74.13          1.01        1.2788    2   1   4
                76.00          1.43        1.2519    3   1   3
                76.21          1.48        1.2490    2   5   3
                79.46          4.46        1.2058    4   0   0
                79.52          1.09        1.2051    0   8   2
                80.34          1.17        1.1949    1   5   4
                81.05          3.79        1.1862    3   3   3
                81.78          7.90        1.1774    3   5   2
                82.01          1.17        1.1747    1   1   5
                81.98          1.36        1.1750    2   7   2
                83.12          1.88        1.1618    2   6   3
                83.58          7.09        1.1565    2   4   4
                83.94          2.68        1.1525    2   8   0
                85.40          2.04        1.1365    3   4   3
                85.78          1.98        1.1324    2   8   1
                86.97          3.87        1.1199    1   3   5
                87.46          1.99        1.1149    4   1   2
                88.95          1.66        1.1000    3   1   4
                89.31          5.90        1.0965    4   2   2
                89.31          4.99        1.0966    3   7   0
                89.40          2.64        1.0957    4   4   0
                89.40          2.64        1.0957    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.