Hydrotalcite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050475
      Allmann R, Jepsen H P
      Neues Jahrbuch fur Mineralogie, Monatshefte 1969 (1969) 544-551
      Die struktur des hydrotalkits
      Locality: Vezna, Western Moravia

      CELL PARAMETERS:   3.146236   3.146236   24.53236   90.00000   90.00000   120.0000
      SPACE GROUP: R-3m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                 5.39        100.00        8.1775    0   0   3
                10.37         34.54        4.0887    0   0   6
                15.47          2.25        2.7081    1   0   1
                15.74         30.60        2.6599    0   1   2
                15.37          1.89        2.7258    0   0   9
                17.54         25.32        2.3821    0   1   5
                20.47         30.73        2.0368    0   1   8
                22.85          7.34        1.8231    1   0  10
                24.13          4.76        1.7258    0   1  11
                26.47          9.67        1.5731    1   1   0
                26.96          9.24        1.5448    1   1   3
                26.85          4.12        1.5514    1   0  13
                28.37          3.00        1.4682    1   1   6
                28.26          1.49        1.4738    0   1  14
                30.78          1.18        1.3540    2   0   2
                31.76          2.66        1.3127    2   0   5
                31.20          3.41        1.3362    1   0  16
                33.52          2.37        1.2450    2   0   8
                35.94          1.12        1.1626    2   0  11
                35.94          1.12        1.1626    2   0  11
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.