Takovite
      Mills S J, Whitfield P S, Kampf A R, Wilson S A, Dipple G M, Raudsepp M, Favreau G
      Journal of Geosciences 58 (2012) 273-279
      Contribution to the crystallography of hydrotalcites:
      the crystal structures of woodallite and takovite
      Note: polytype 3R
      Note: calculated chemical formula differs from expected
      Locality: Agoudal mine, Bou Azzer district, Tazenakht, Morocco
      _database_code_amcsd 0019806

      CELL PARAMETERS:    3.0290   3.0290  22.5995   90.000   90.000  120.000
      SPACE GROUP: R-3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    179.568
      Density (g/cm3):      2.806
      MAX. ABS. INTENSITY / VOLUME**2:      51.11530792    
      RIR:      5.932
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.75        100.00        7.5332    0   0   3         2
                23.62         29.64        3.7666    0   0   6         2
                34.42          1.86        2.6057    1   0   1         6
                35.12         26.60        2.5552    0   1   2         6
                37.81          3.84        2.3793    1   0   4         6
                39.73         22.42        2.2688    0   1   5         6
                44.50          2.19        2.0359    1   0   7         6
                47.29         20.81        1.9222    0   1   8         6
                48.33          1.36        1.8833    0   0  12         2
                53.52          7.17        1.7122    1   0  10         6
                56.93          5.10        1.6175    0   1  11         6
                61.20          7.60        1.5145    1   1   0         6
                62.56          8.86        1.4848    1   1   3        12
                64.28          3.93        1.4491    1   0  13         6
                66.55          4.41        1.4052    1   1   6        12
                68.22          2.15        1.3748    0   1  14         6
                72.56          1.63        1.3028    2   0   2         6
                72.95          1.06        1.2969    1   1   9        12
                75.47          2.66        1.2596    2   0   5         6
                76.62          3.16        1.2436    1   0  16         6
                80.79          2.25        1.1896    2   0   8         6
                85.62          1.04        1.1344    0   2  10         6
                88.43          1.35        1.1055    2   0  11         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.