Sillimanite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R060787
      Winter J K, Ghose S
      American Mineralogist 64 (1979) 573-586
      Thermal expansion and high-temperature crystal chemistry of the Al2SiO5
      polymorphs
      T = 25 deg C

      CELL PARAMETERS:   7.488300   7.680800   5.777400   90.00000   90.00000   90.00000
      SPACE GROUP: Pbnm
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.55         19.05        5.3573    1   1   0
                19.42          3.30        4.5703    1   0   1
                23.18          1.25        3.8363    0   2   0
                23.77          7.27        3.7419    2   0   0
                26.09         79.65        3.4139    1   2   0
                26.49        100.00        3.3632    2   1   0
                30.97         17.39        2.8858    0   0   2
                33.44         27.14        2.6787    2   2   0
                35.31         49.66        2.5407    1   1   2
                37.13         11.49        2.4201    1   3   0
                37.91          1.24        2.3724    3   1   0
                39.04          1.71        2.3062    0   2   2
                39.41          9.35        2.2852    2   0   2
                40.93         67.37        2.2039    1   2   2
                42.80         14.48        2.1115    2   3   0
                43.24          3.03        2.0913    3   2   0
                45.73          1.48        1.9829    2   3   1
                46.21          1.05        1.9633    2   2   2
                48.64          8.65        1.8709    4   0   0
                49.72          7.75        1.8326    3   1   2
                50.16          1.48        1.8177    4   1   0
                51.12          3.01        1.7858    3   3   0
                53.66          8.64        1.7069    2   4   0
                54.12          7.38        1.6934    3   2   2
                54.54         14.12        1.6816    4   2   0
                57.67         16.92        1.5975    0   4   2
                58.78          8.58        1.5699    4   0   2
                59.09          3.04        1.5623    1   4   2
                60.12          1.69        1.5380    4   1   2
                60.97         41.88        1.5185    3   3   2
                64.04          4.40        1.4529    4   2   2
                64.54         17.91        1.4429    0   0   4
                65.72          3.94        1.4198    2   5   0
                67.08          6.18        1.3944    5   2   0
                70.23          4.38        1.3393    4   4   0
                70.60         12.66        1.3332    1   5   2
                70.85          6.58        1.3291    1   2   4
                71.04          7.78        1.3260    2   1   4
                72.09          3.14        1.3092    5   1   2
                72.23          1.18        1.3070    3   5   0
                74.09          1.80        1.2788    0   6   0
                74.42         14.21        1.2739    2   5   2
                74.67          3.72        1.2703    2   2   4
                75.70         11.38        1.2555    5   2   2
                76.29          3.97        1.2473    6   0   0
                76.87          3.60        1.2393    1   3   4
                77.35          1.18        1.2328    3   1   4
                77.47          1.84        1.2311    6   1   0
                78.71          2.85        1.2149    4   4   2
                80.58          1.69        1.1913    2   3   4
                81.59          3.61        1.1791    5   3   2
                84.79          2.03        1.1426    4   0   4
                86.69          1.12        1.1223    3   3   4
                87.31          1.09        1.1159    2   6   2
                88.71          3.19        1.1020    2   4   4
                89.18          1.53        1.0974    4   5   2
                89.20          1.18        1.0971    6   2   2
                89.42          5.08        1.0950    4   2   4
                89.71          1.22        1.0922    5   4   2
                89.71          1.22        1.0922    5   4   2
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.