Ferrihydrite
      Jansen E, Kyek A, Schafer W, Schwertmann U
      Applied Physics A74 (2002) S1004-S1006
      The structure of six-line ferrihydrite
      Locality: synthetic
      Sample: defect-free refinement
      _database_code_amcsd 0012029

      CELL PARAMETERS:    2.9550   2.9550   9.3700   90.000   90.000  120.000
      SPACE GROUP: P-31c     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     70.857
      Density (g/cm3):      2.934
      MAX. ABS. INTENSITY / VOLUME**2:      10.83696804    
      RIR:      1.203
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.94         70.57        4.6850    0   0   2         2
                35.06         74.79        2.5591    1   0   0         6
                36.39         43.14        2.4687    1   0   1        12
                38.43         15.22        2.3425    0   0   4         2
                40.15         24.95        2.2459    1   0   2        12
                45.84        100.00        1.9795    1   0   3        12
                52.99         15.79        1.7279    1   0   4        12
                61.31         67.85        1.5120    1   0   5        12
                62.90         51.93        1.4775    1   1   0         6
                66.34          3.17        1.4091    2  -1   2         6
                66.34          3.17        1.4091    1   1   2         6
                74.10          5.43        1.2796    2   0   0         6
                74.90          5.46        1.2678    2   0   1        12
                76.18          6.05        1.2497    2  -1   4         6
                76.18          6.05        1.2497    1   1   4         6
                77.30          1.74        1.2343    2   0   2        12
                81.25         11.38        1.1840    2   0   3        12
                82.33          5.01        1.1712    0   0   8         2
                86.71          3.12        1.1229    2   0   4        12
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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.