Hydrotalcite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050457
      Allmann R, Jepsen H P
      Neues Jahrbuch fur Mineralogie, Monatshefte 1969 (1969) 544-551
      Die struktur des hydrotalkits
      Locality: Vezna, Western Moravia

      CELL PARAMETERS:   3.075426   3.075426   23.55785   90.00000   90.00000   120.0000
      SPACE GROUP: R-3m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                11.32        100.00        7.8526    0   0   3
                22.69         34.54        3.9263    0   0   6
                33.90          2.25        2.6465    1   0   1
                34.56         30.60        2.5978    0   1   2
                34.29          1.89        2.6175    0   0   9
                38.87         25.32        2.3186    0   1   5
                45.97         30.73        1.9753    0   1   8
                51.83          7.34        1.7646    1   0  10
                55.03          4.76        1.6690    0   1  11
                60.18          9.67        1.5377    1   1   0
                61.45          9.24        1.5091    1   1   3
                61.94          4.12        1.4982    1   0  13
                65.15          3.00        1.4318    1   1   6
                65.63          1.49        1.4226    0   1  14
                71.26          1.18        1.3233    2   0   2
                73.96          2.66        1.2815    2   0   5
                73.48          3.41        1.2886    1   0  16
                78.87          2.37        1.2134    2   0   8
                85.93          1.12        1.1309    2   0  11
                85.93          1.12        1.1309    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.