Ruizite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R060930
      Moore P B, Shen J, Araki T
      American Mineralogist 70 (1985) 171-181
      Crystal chemistry of the (M2)3+ phi2 sheet: Structural principles and crystal
      structures of ruizite, macfallite and orientite
      _database_code_amcsd 0000967

      CELL PARAMETERS:   9.0560  6.1700 11.9200   90.000   91.300   90.000
      SPACE GROUP: C2/m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Mn     0.25000   0.25000   0.00000     1.000     0.700
            Ca     0.20540   0.50000   0.25990     1.000     1.300
            Si     0.03550   0.00000   0.15130     1.000     0.500
            O      0.13280   0.21650   0.12910     1.000     1.000
            O      0.37480   0.50000   0.09210     1.000     1.000
            O     -0.00630   0.00000   0.28570     1.000     1.000
            Si     0.10420   0.00000   0.39510     1.000     0.500
            O      0.20560   0.21500   0.39540     0.500     1.000
            OH     0.20560   0.21500   0.39540     0.500     1.000
            O      0.00000   0.00000   0.50000     1.000     1.000
            OH     0.36740   0.00000   0.04590     1.000     1.000
            OH     0.44370   0.00000   0.27810     1.000     1.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  8 +/-  5 +/- 10
            MAX. ABS. INTENSITY / VOLUME**2:      35.19089792    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                 7.42        100.00       11.9169    0   0   1
                17.39         19.05        5.0986    1   1   0
                18.84          2.91        4.7094   -1   1   1
                19.61          2.93        4.5268    2   0   0
                21.15         19.49        4.2003    2   0   1
                22.38          3.31        3.9723    0   0   3
                23.10          1.35        3.8497    1   1   2
                24.42          5.12        3.6446   -2   0   2
                24.97          1.67        3.5658    2   0   2
                28.66         14.47        3.1143    1   1   3
                28.94          4.17        3.0850    0   2   0
                29.58          2.69        3.0199   -2   0   3
                29.92          4.76        2.9865    0   2   1
                30.27          6.56        2.9527    2   0   3
                32.69         11.48        2.7396    0   2   2
                33.04          2.87        2.7110    3   1   0
                33.76          6.16        2.6552   -3   1   1
                34.07          3.22        2.6319    3   1   1
                34.68          6.23        2.5867   -1   1   4
                35.08          1.83        2.5581    1   1   4
                35.20          9.68        2.5493    2   2   0
                35.70          7.30        2.5150   -2   0   4
                35.93          1.39        2.4994   -2   2   1
                36.12          1.91        2.4868   -3   1   2
                36.12          1.75        2.4864    2   2   1
                38.59         10.53        2.3330    2   2   2
                42.37          2.54        2.1331    2   2   3
                42.46          3.96        2.1289   -2   0   5
                45.68          2.28        1.9861   -4   0   3
                45.71          1.41        1.9851    3   1   4
                45.84          1.04        1.9794   -1   3   1
                48.25          2.04        1.8861    0   2   5
                50.05          1.25        1.8223   -4   0   4
                51.24          3.19        1.7829    4   0   4
                52.15          2.47        1.7539   -4   2   2
                52.73          3.78        1.7360    4   2   2
                53.85          1.96        1.7024    0   0   7
                53.95          1.28        1.6995    3   3   0
                54.44          1.35        1.6855   -3   3   1
                54.98          2.11        1.6700    0   2   6
                55.82          6.99        1.6469    4   2   3
                58.55          2.42        1.5766   -2   2   6
                59.97          4.40        1.5425    0   4   0
                62.33          1.31        1.4896    0   0   8
                63.65          4.15        1.4619   -4   2   5
                64.34          1.07        1.4479    2   4   1
                66.42          1.25        1.4075    2   2   7
                69.65          1.33        1.3499   -6   2   1
                71.00          1.82        1.3276   -6   2   2
                71.79          1.45        1.3149   -2   4   4
                78.63          1.48        1.2168    0   2   9
                82.73          1.02        1.1665    4   4   4
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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.