Sillimanite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R060080
      Yang H, Hazen R M, Finger L W, Prewitt C T, Downs R T
      Physics and Chemistry of Minerals 25 (1997) 39-47
      Compressibility and crystal structure of sillimanite, Al2SiO5, at high pressure
      Sample: P = 5.29 GPa

      CELL PARAMETERS:   7.483900   7.672600   5.768100   90.00000   90.00000   90.00000
      SPACE GROUP: Pbnm
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.53         19.13        5.3575    1   1   0
                19.41          3.40        4.5697    1   0   1
                23.16          1.27        3.8360    0   2   0
                23.75          7.20        3.7423    2   0   0
                26.08         80.43        3.4138    1   2   0
                26.47        100.00        3.3635    2   1   0
                30.40          1.13        2.9381    1   2   1
                30.97         17.60        2.8850    0   0   2
                33.42         27.63        2.6787    2   2   0
                35.30         49.94        2.5401    1   1   2
                37.12         11.48        2.4200    1   3   0
                37.89          1.28        2.3726    3   1   0
                39.03          1.68        2.3057    0   2   2
                39.40          9.33        2.2849    2   0   2
                40.92         68.49        2.2035    1   2   2
                42.79         14.43        2.1114    2   3   0
                43.22          3.13        2.0915    3   2   0
                45.72          1.73        1.9828    2   3   1
                46.20          1.14        1.9630    2   2   2
                48.62          8.85        1.8712    4   0   0
                49.71          7.76        1.8325    3   1   2
                50.14          1.56        1.8179    4   1   0
                51.10          2.91        1.7858    3   3   0
                53.65          8.71        1.7069    2   4   0
                54.11          7.55        1.6933    3   2   2
                54.52         14.19        1.6818    4   2   0
                57.66         17.48        1.5972    0   4   2
                58.77          8.93        1.5699    4   0   2
                59.09          3.07        1.5621    1   4   2
                60.11          1.65        1.5380    4   1   2
                60.96         42.27        1.5185    3   3   2
                64.03          4.54        1.4529    4   2   2
                64.55         18.17        1.4425    0   0   4
                65.71          4.01        1.4197    2   5   0
                67.06          6.37        1.3945    5   2   0
                70.21          4.59        1.3394    4   4   0
                70.59         12.76        1.3331    1   5   2
                70.86          6.77        1.3287    1   2   4
                71.04          7.74        1.3257    2   1   4
                72.08          3.24        1.3092    5   1   2
                72.22          1.19        1.3070    3   5   0
                74.08          1.83        1.2787    0   6   0
                74.41         14.37        1.2738    2   5   2
                74.67          3.79        1.2701    2   2   4
                75.68         11.83        1.2555    5   2   2
                76.26          4.11        1.2474    6   0   0
                76.87          3.70        1.2391    1   3   4
                77.35          1.21        1.2326    3   1   4
                77.45          1.85        1.2313    6   1   0
                78.70          2.95        1.2148    4   4   2
                80.58          1.70        1.1911    2   3   4
                81.58          3.66        1.1791    5   3   2
                84.79          2.10        1.1424    4   0   4
                86.69          1.10        1.1222    3   3   4
                87.31          1.15        1.1158    2   6   2
                88.71          3.26        1.1018    2   4   4
                89.17          1.57        1.0973    4   5   2
                89.18          1.18        1.0972    6   2   2
                89.42          5.10        1.0949    4   2   4
                89.69          1.23        1.0922    5   4   2
                89.69          1.23        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.