Kernite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050661
      Cooper W F, Larsen F K, Coppens P, Giese R F
      American Mineralogist 58 (1973) 21-31
      Electron population analysis of accurate diffraction data. V. Structure and
      one-center charge refinement of the light-atom mineral kernite,
      Na2B4O6(OH)2.3H2O
      high order refinement

      CELL PARAMETERS:   7.016588   9.155637   15.67782   90.00000   108.8638   90.00000
      SPACE GROUP: P2_1/c
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                11.38         35.63        7.7914    0   1   1
                11.95        100.00        7.4179    0   0   2
                13.35         63.85        6.6397    1   0   0
                14.77         15.36        6.0054   -1   0   2
                16.51          2.14        5.3751    1   1   0
                18.99          5.17        4.6768    1   1   1
                20.31          4.01        4.3743    0   2   1
                20.42          1.03        4.3511    0   1   3
                20.65          2.64        4.3039    1   0   2
                21.00          6.86        4.2330   -1   1   3
                22.84          2.16        3.8957    0   2   2
                22.84         24.31        3.8950    1   1   2
                23.40          6.14        3.8036   -1   0   4
                24.00         12.02        3.7089    0   0   4
                25.37         10.42        3.5126   -1   1   4
                25.93          2.55        3.4376    0   1   4
                26.54          9.05        3.3594    0   2   3
                26.86          2.00        3.3199    2   0   0
                26.99          8.86        3.3041   -1   2   3
                27.36          6.42        3.2603   -2   1   1
                27.44         33.77        3.2517   -2   1   2
                27.53          4.37        3.2411    1   1   3
                28.47         43.69        3.1357    1   2   2
                28.61         11.34        3.1210    2   1   0
                28.82          1.37        3.0984   -2   1   3
                29.90          4.02        2.9893    0   3   1
                30.56          1.33        2.9256   -1   2   4
                31.03         17.68        2.8827    2   1   1
                31.04          9.53        2.8818    0   2   4
                31.20          4.55        2.8673    1   0   4
                31.36          4.75        2.8532   -2   1   4
                31.71          3.39        2.8223    0   3   2
                32.26          3.30        2.7749   -2   2   1
                32.29          9.72        2.7730    1   3   0
                32.33          3.15        2.7696   -2   2   2
                33.34          4.01        2.6875    2   2   0
                33.53          3.87        2.6731   -2   2   3
                34.37          7.88        2.6095   -1   0   6
                34.88         12.12        2.5720   -1   2   5
                34.89          2.34        2.5713   -1   3   3
                35.76          8.81        2.5108   -2   2   4
                36.33         17.65        2.4726    0   0   6
                36.99          4.13        2.4300    1   2   4
                37.68          5.31        2.3871    0   1   6
                38.99          3.54        2.3097   -2   1   6
                39.27          9.31        2.2941   -2   3   2
                39.76          1.35        2.2670   -1   2   6
                39.79          1.64        2.2654   -3   1   2
                40.11          1.23        2.2480   -3   1   3
                40.13          2.15        2.2468    2   3   0
                40.43          2.68        2.2309   -3   1   1
                40.76          6.17        2.2132    3   0   0
                41.27          1.43        2.1872    0   4   2
                41.37          4.39        2.1822   -3   1   4
                41.74          1.46        2.1639    1   4   0
                41.96          3.72        2.1528    2   3   1
                42.25         10.09        2.1388   -1   4   2
                42.49          3.61        2.1274    0   3   5
                42.72          1.27        2.1165   -2   2   6
                43.18          5.81        2.0949    2   1   4
                43.51          5.21        2.0798   -3   1   5
                43.56          3.36        2.0772    0   4   3
                43.72          2.17        2.0700   -2   1   7
                43.75          1.04        2.0687   -3   2   3
                43.84          1.29        2.0648    0   1   7
                43.86          2.70        2.0639   -1   4   3
                44.13          1.65        2.0517    1   1   6
                44.96          1.37        2.0160   -2   3   5
                45.06          2.01        2.0118   -1   2   7
                45.29          4.66        2.0018   -3   0   6
                46.37          1.11        1.9576   -1   0   8
                47.25          1.93        1.9233    0   2   7
                47.48          1.52        1.9143   -1   1   8
                47.50          5.12        1.9138   -2   4   1
                47.53          4.25        1.9127    1   2   6
                47.55          6.38        1.9117    3   1   2
                47.81          2.90        1.9019    1   3   5
                47.82          3.39        1.9018   -2   0   8
                48.31          1.02        1.8835    2   1   5
                48.42          5.84        1.8794   -2   4   3
                49.07          3.16        1.8560   -3   3   2
                49.70          2.20        1.8341   -3   2   6
                49.88          4.14        1.8279    2   4   1
                50.10          6.37        1.8203   -2   4   4
                50.71          1.33        1.7999   -1   2   8
                50.96          1.51        1.7917    3   3   0
                51.04          3.64        1.7888    1   4   4
                51.35          2.41        1.7788    3   1   3
                51.38          2.91        1.7778    0   5   2
                51.77          1.38        1.7652    1   5   0
                51.98          4.85        1.7587    2   3   4
                52.22          2.43        1.7513    2   4   2
                52.44          3.24        1.7445   -4   0   2
                52.56          1.46        1.7408    0   3   7
                52.73          2.27        1.7355    1   5   1
                53.15          5.69        1.7227   -4   1   3
                53.22          1.85        1.7207   -1   4   6
                53.28          5.04        1.7188    0   2   8
                53.71          1.33        1.7061   -1   1   9
                54.51          1.74        1.6828   -4   1   1
                54.62          1.03        1.6797    0   4   6
                54.83          1.02        1.6739   -3   3   6
                55.08          1.22        1.6668    1   4   5
                55.69          1.42        1.6499   -1   5   4
                55.83          1.19        1.6461    3   3   2
                56.56          1.21        1.6267    1   1   8
                56.67          1.98        1.6236   -1   2   9
                56.72          1.69        1.6223    0   1   9
                57.04          2.84        1.6141   -2   3   8
                59.91          1.17        1.5433    1   5   4
                63.81          1.22        1.4581    0   6   3
                65.87          1.16        1.4173    3   1   6
                66.19          1.17        1.4113    0   2  10
                66.71          1.01        1.4015   -4   3   7
                68.46          1.36        1.3699   -1   6   5
                77.59          2.02        1.2298    4   5   0
                77.59          2.02        1.2298    4   5   0
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.