Sepiolite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R070311
      Brauner K, Preisinger A
      Tschermaks Mineralogische und Petrographische Mitteilungen 6 (1956) 120-140
      Struktur und entstehung des sepioliths

      CELL PARAMETERS:   13.38063   27.03346   5.011975   90.00000   90.00000   90.00000
      SPACE GROUP: Pncn
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                 7.38        100.00       11.9920    1   1   0
                11.84          8.47        7.4743    1   3   0
                13.23          2.10        6.6903    2   0   0
                18.00          1.13        4.9280    0   1   1
                17.69          1.85        5.0129    1   5   0
                20.27          2.51        4.3801    0   3   1
                19.70          4.38        4.5056    0   6   0
                20.17          2.45        4.4007    3   1   0
                21.34          9.88        4.1627    1   3   1
                22.40          1.10        3.9678    2   1   1
                23.12          2.06        3.8455    2   2   1
                24.28          2.46        3.6646    2   3   1
                23.80          4.64        3.7371    2   6   0
                25.82          4.05        3.4494    2   4   1
                25.88          2.29        3.4406    3   5   0
                26.64         10.33        3.3452    4   0   0
                28.55         15.03        3.1251    3   3   1
                33.34          4.90        2.6858    4   6   0
                33.63          2.45        2.6631    5   1   0
                34.69          2.83        2.5844    2   8   1
                36.46          1.65        2.4632    1   0   2
                35.46         11.51        2.5300    1   9   1
                38.33          2.23        2.3468    2   0   2
                38.48          3.41        2.3380    2   1   2
                37.38          5.03        2.4043    2   9   1
                37.90          2.44        2.3726    3   8   1
                41.20          2.05        2.1900    0   6   2
                41.44          1.52        2.1777    3   1   2
                40.20          1.26        2.2418    2  10   1
                40.41          3.01        2.2310    3   9   1
                40.42          1.69        2.2301    6   0   0
                45.18          2.55        2.0056    4   0   2
                44.35          1.98        2.0412    4   9   1
                46.15          1.26        1.9658    3   6   2
                47.66          1.02        1.9068    7   1   0
                55.94          1.36        1.6427    0   3   3
                55.09          2.24        1.6660    6   0   2
                54.37          1.12        1.6862    6   9   1
                58.40          1.31        1.5790    7   8   1
                58.16          1.24        1.5852    3  15   1
                62.35          1.85        1.4883    1   8   3
                63.69          2.04        1.4600    0   9   3
                61.72          1.68        1.5019    0  18   0
                67.25          1.40        1.3912    8   0   2
                66.62          1.03        1.4029    8   9   1
                76.27          1.24        1.2475    1   0   4
                73.49          2.19        1.2877    9   9   1
                73.85          1.09        1.2823    1  18   2
                73.85          1.09        1.2823    1  18   2
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.