Birnessite
      Lanson B, Drits V A, Feng Q, Manceau A
      American Mineralogist 87 (2002) 1662-1671
      Structure of synthetic Na-rich birnessite: Evidence for a triclinic
      one-layer unit cell
      _database_code_amcsd 0002932

      CELL PARAMETERS:    2.9513   2.9547   7.3340   78.720  101.790  122.330
      SPACE GROUP: P-1       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     52.611
      Density (g/cm3):      2.487
      MAX. ABS. INTENSITY / VOLUME**2:      19.39471314    
      RIR:      2.539
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.40        100.00        7.1401    0   0   1         2
                24.94         37.18        3.5700    0   0   2         2
                35.65         15.25        2.5186   -1   1   0         2
                36.97          9.22        2.4314   -1   0   1         2
                37.07          8.04        2.4251    0   1   1         2
                37.80          2.43        2.3800    0   0   3         2
                40.61          7.87        2.2214    1  -1   1         2
                41.83          9.36        2.1597   -1   0   2         2
                42.10         12.23        2.1462    0   1   2         2
                48.78         14.51        1.8670    1  -1   2         2
                49.85         10.64        1.8292   -1   0   3         2
                50.26          8.60        1.8155    0   1   3         2
                55.92          3.52        1.6441   -1   1   4         2
                56.26          2.71        1.6351    0  -1   3         2
                56.79          3.67        1.6211    1   0   3         2
                60.15          1.74        1.5384   -1   0   4         2
                60.65          1.89        1.5269    0   1   4         2
                62.97          2.70        1.4761   -1   2   1         2
                63.05          4.18        1.4744   -2   1   1         2
                64.31          2.77        1.4486   -1   2   0         2
                64.52          1.47        1.4442   -2   1   0         2
                64.56          1.81        1.4436   -2   1   2         2
                64.62          2.80        1.4424   -1   2   2         2
                65.55          2.56        1.4241    1   1   0         2
                66.87          2.38        1.3991   -1  -1   1         2
                67.14          1.91        1.3941    1   1   1         2
                67.63          1.83        1.3853   -1   1   5         2
                67.78          2.02        1.3826    0  -1   4         2
                68.39          1.67        1.3717    1   0   4         2
                77.19          1.45        1.2358   -2   2   3         2
                79.77          1.04        1.2022    0  -2   1         2
                80.30          1.54        1.1957    2   0   1         2
                80.76          1.42        1.1900    0   0   6         2
                81.12          1.35        1.1856    0  -1   5         2
                81.12          1.41        1.1856   -1   1   6         2
                81.82          1.46        1.1772    1   0   5         2
                85.43          1.12        1.1364    0  -2   2         2
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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.