Quintinite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070709
      Arakcheeva A V, Pushcharovsky D Y, Rastsvetaeva R K, Atencio D, Lubman G U
      Crystallography Reports 41 (1996) 972-981
      Crystal structure and comparative crystal chemistry of Al2Mg4(OH)12(CO3)*3H2O,
      a new mineral from the hydrotalcite-manasseite group
      Note polytype 2H
      Locality: synthetic
      _database_code_amcsd 0012351

      CELL PARAMETERS:   5.2640  5.2640 15.0390   90.000   90.000  120.000
      SPACE GROUP: P-62m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Mg     0.33333   0.66667   0.24300     1.000     1.800
            Al     0.00000   0.00000   0.25900     1.000     2.600
            O      0.00000   0.65100   0.32500     1.000     2.900
            C      0.00000   0.00000   0.02100     0.500     6.300
            O      0.31800   0.00000   0.19000     1.000     2.700
            O      0.24400   0.00000   0.00000     1.000     4.300
            Wa     0.59800   0.00000   0.50000     1.000     6.500
            H      0.35000   0.35000   0.39800     1.000     3.000
            H      0.00000   0.36000   0.12500     1.000     3.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  4 +/- 13
            MAX. ABS. INTENSITY / VOLUME**2:      14.14856242    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                 5.88          1.40       15.0390    0   0   1
                11.77        100.00        7.5195    0   0   2
                19.47          1.08        4.5588    1   0   0
                20.36         11.05        4.3627    1   0   1
                23.66         35.98        3.7597    0   0   4
                26.43          6.28        3.3727    1   0   3
                34.60         30.50        2.5926    1   1   1
                35.83          2.22        2.5065    0   0   6
                36.16         18.49        2.4842    1   1   2
                38.64          8.00        2.3303    1   1   3
                40.01          2.07        2.2536    2   0   1
                41.90         14.51        2.1562    1   1   4
                45.81         16.14        1.9807    1   1   5
                46.74          1.89        1.9434    1   0   7
                50.22          2.06        1.8167    2   0   5
                50.27         21.89        1.8151    1   1   6
                53.16          1.40        1.7230    2   1   0
                60.52          6.36        1.5298    1   1   8
                60.97         10.41        1.5196    3   0   0
                62.34          7.68        1.4895    3   0   2
                66.35          3.23        1.4089    3   0   4
                72.37          3.24        1.3058    1   1  10
                72.98          1.26        1.2963    2   2   2
                76.73          1.70        1.2421    2   2   4
                78.90          1.05        1.2133    1   1  11
                82.85          2.12        1.1652    2   2   6
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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.