Crednerite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070404
      Topfer J, Trari M, Gravereau P, Chaminade J P, Doumerc J P
      Zeitschrift fur Kristallographie 210 (1995) 184-187
      Crystal growth and reinvestigation of the crystal structure of crednerite, CuMnO2
      Locality: synthetic

      CELL PARAMETERS:   5.5620  2.8820  5.8900   90.000  104.400   90.000
      SPACE GROUP: C2/m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Cu     0.00000   0.50000   0.50000     1.000     0.861
            Mn     0.00000   0.00000   0.00000     0.960     0.403
            Cu     0.00000   0.00000   0.00000     0.040     0.403
            O      0.40700   0.00000   0.17890     1.000     0.505

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  2 +/-  5
            MAX. ABS. INTENSITY / VOLUME**2:      59.69199171    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                31.36         51.46        2.8525    0   0   2
                33.06          4.73        2.7098   -2   0   1
                33.26         77.57        2.6936    2   0   0
                35.32         10.54        2.5412    1   1   0
                37.00        100.00        2.4297   -1   1   1
                39.91         20.98        2.2588   -2   0   2
                40.52         43.07        2.2263    1   1   1
                44.90          1.07        2.0187   -1   1   2
                47.83          2.23        1.9017    0   0   3
                52.18         19.12        1.7529    2   0   2
                56.98         30.46        1.6162   -1   1   3
                59.37         29.13        1.5567   -3   1   1
                64.56         21.10        1.4435    1   1   3
                64.69         10.71        1.4410    0   2   0
                65.44          6.29        1.4262    0   0   4
                66.06          9.26        1.4143   -2   0   4
                66.79          8.75        1.4006    3   1   1
                69.36          5.31        1.3549   -4   0   2
                69.84          3.98        1.3468    4   0   0
                70.57          8.83        1.3347   -3   1   3
                73.65          6.85        1.2862    0   2   2
                74.71         10.10        1.2706    2   2   0
                78.78          4.65        1.2148   -2   2   2
                84.38          1.87        1.1479    2   0   4
                86.09          3.77        1.1294   -4   0   4
                87.44          3.78        1.1155    4   0   2
                87.67          6.25        1.1131    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.