Goethite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R050142
      Gualtieri A, Venturelli P
      American Mineralogist 84 (1999) 895-904
      In situ study of the goethite-hematite phase transformation by real time
      synchrotron powder diffraction
      Sample at T = 25 C

      CELL PARAMETERS:   9.9613  3.0226  4.6017   90.000   90.000   90.000
      SPACE GROUP: Pnma      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Fe     0.14590   0.25000  -0.04860     1.000     3.869
            H     -0.10100   0.25000  -0.39900     1.000     4.737
            O     -0.19900   0.25000   0.28500     1.000     3.632
            O     -0.05170   0.25000  -0.19600     1.000     3.632

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  9 +/-  2 +/-  4
            MAX. ABS. INTENSITY / VOLUME**2:      35.32206878    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                17.81         12.43        4.9806    2   0   0
                21.27        100.00        4.1775    1   0   1
                26.37         10.49        3.3799    2   0   1
                33.27         39.09        2.6926    3   0   1
                34.72         20.59        2.5840    2   1   0
                35.53          4.92        2.5263    0   1   1
                36.07         13.30        2.4903    4   0   0
                36.70         59.95        2.4488    1   1   1
                39.15          2.42        2.3008    0   0   2
                40.02          8.39        2.2531    2   1   1
                40.23          3.07        2.2418    1   0   2
                41.22         13.57        2.1902    4   0   1
                45.09          3.22        2.0106    3   1   1
                47.29          4.73        1.9220    4   1   0
                50.70          7.35        1.8006    1   1   2
                51.53          1.87        1.7735    4   1   1
                53.31         23.31        1.7184    2   1   2
                54.28          6.80        1.6900    4   0   2
                55.34          2.17        1.6602    6   0   0
                57.48          4.18        1.6032    3   1   2
                59.05         14.13        1.5644    5   1   1
                61.34          6.19        1.5113    0   2   0
                61.58          2.80        1.5061    5   0   2
                63.02          1.89        1.4751    4   1   2
                63.46          2.43        1.4660    2   0   3
                63.98          5.88        1.4552    6   1   0
                65.70          3.15        1.4212    1   2   1
                67.23          2.21        1.3925    3   0   3
                68.61          2.36        1.3678    0   1   3
                69.09          2.68        1.3595    7   0   1
                69.35          1.01        1.3551    1   1   3
                71.53          1.01        1.3190    2   1   3
                71.60          3.22        1.3179    3   2   1
                73.27          1.26        1.2920    4   2   0
                76.60          1.16        1.2439    4   2   1
                80.03          1.30        1.1989    4   1   3
                84.84          1.02        1.1428    1   0   4
                86.37          1.30        1.1265    4   2   2
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.