Poldervaartite
      Dai Y S, Harlow G E, McGhie A R
      American Mineralogist 78 (1993) 1082-1087
      Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the
      Kalahari manganese field, South Africa: Crystal structure and description
      _database_code_amcsd 0001615

      CELL PARAMETERS:    9.3980   9.1390  10.5350   90.000   90.000   90.000
      SPACE GROUP: Pbca      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    904.833
      Density (g/cm3):      2.865
      MAX. ABS. INTENSITY / VOLUME**2:      10.23687396    
      RIR:      1.164
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                15.93          1.44        5.5637    1   1   1         8
                16.83         13.03        5.2675    0   0   2         2
                19.32          2.56        4.5950    1   0   2         4
                19.43          1.81        4.5695    0   2   0         2
                21.19         20.47        4.1921    0   2   1         4
                21.26         23.00        4.1790    2   1   0         4
                21.65          5.84        4.1053    1   1   2         8
                22.89         17.70        3.8845    2   1   1         8
                23.23          2.87        3.8285    1   2   1         8
                25.40         24.27        3.5065    2   0   2         4
                25.81          2.47        3.4517    0   2   2         4
                27.22          9.36        3.2760    2   2   0         4
                27.24         10.35        3.2738    2   1   2         8
                27.53        100.00        3.2401    1   2   2         8
                28.53          1.03        3.1282    2   2   1         8
                28.85          2.00        3.0951    1   1   3         8
                31.36         31.83        2.8527    3   1   1         8
                32.03         21.50        2.7941    1   3   1         8
                32.15          9.67        2.7844    0   2   3         4
                32.18          3.56        2.7818    2   2   2         8
                33.28         10.16        2.6925    3   0   2         4
                33.33          1.81        2.6885    2   1   3         8
                33.57         11.38        2.6697    1   2   3         8
                34.04         19.73        2.6337    0   0   4         2
                34.73         29.98        2.5827    3   1   2         8
                35.11         18.36        2.5562    2   3   0         4
                35.35          1.16        2.5390    1   3   2         8
                35.39          2.56        2.5360    1   0   4         4
                35.78         20.22        2.5094    3   2   1         8
                36.16          4.20        2.4841    2   3   1         8
                36.78          6.29        2.4437    1   1   4         8
                37.55         49.74        2.3954    2   2   3         8
                38.82          3.75        2.3197    3   2   2         8
                39.17          5.38        2.2997    2   3   2         8
                39.21          1.84        2.2975    2   0   4         4
                39.49          6.41        2.2819    0   2   4         4
                39.80          1.15        2.2648    3   1   3         8
                40.40          1.45        2.2328    0   4   1         4
                40.56          6.71        2.2242    4   1   1         8
                40.69          2.48        2.2174    1   2   4         8
                42.11          6.91        2.1457    4   0   2         4
                42.26          1.51        2.1385    3   3   1         8
                43.16          2.93        2.0961    0   4   2         4
                43.30          6.70        2.0895    4   2   0         4
                43.81          9.49        2.0666    2   3   3         8
                44.07          3.41        2.0547    2   4   0         4
                44.19          2.55        2.0496    4   2   1         8
                44.27         13.73        2.0458    1   4   2         8
                44.93          2.28        2.0174    3   3   2         8
                44.95          2.10        2.0167    2   4   1         8
                44.97          1.27        2.0159    3   0   4         4
                46.11          3.12        1.9686    3   1   4         8
                46.60          1.68        1.9491    1   3   4         8
                46.77          9.08        1.9423    4   2   2         8
                47.48          8.96        1.9151    0   4   3         4
                47.50          2.60        1.9143    2   4   2         8
                47.62          4.34        1.9096    4   1   3         8
                48.51          1.28        1.8765    1   4   3         8
                48.56          2.56        1.8749    1   2   5         8
                48.96          2.17        1.8604    4   3   0         4
                49.41          1.87        1.8444    3   2   4         8
                49.70          1.60        1.8343    2   3   4         8
                49.77          5.46        1.8321    4   3   1         8
                50.85          1.92        1.7957    4   2   3         8
                51.53         10.72        1.7735    2   4   3         8
                51.57         14.43        1.7721    2   2   5         8
                51.63          6.16        1.7703    5   0   2         4
                52.09          3.67        1.7558    0   0   6         2
                52.17          1.30        1.7533    4   0   4         4
                52.66          1.14        1.7380    5   1   2         8
                53.06          2.57        1.7260    1   0   6         4
                53.06          2.94        1.7259    0   4   4         4
                53.20          2.20        1.7219    4   1   4         8
                53.35          8.36        1.7172    3   1   5         8
                53.79          6.63        1.7042    1   3   5         8
                53.99          5.60        1.6984    1   5   2         8
                54.02          2.80        1.6975    1   4   4         8
                54.07          3.18        1.6960    1   1   6         8
                54.59          2.26        1.6812    3   3   4         8
                55.68          6.94        1.6507    5   2   2         8
                55.90          3.97        1.6448    2   0   6         4
                55.93          2.51        1.6440    4   3   3         8
                56.15         10.85        1.6380    4   4   0         4
                56.19          4.65        1.6369    4   2   4         8
                56.34          2.18        1.6329    3   2   5         8
                56.61          2.19        1.6259    2   3   5         8
                56.83          1.32        1.6200    2   4   4         8
                56.88          1.06        1.6188    2   1   6         8
                57.04          5.50        1.6146    1   2   6         8
                57.70          4.25        1.5977    1   5   3         8
                58.35          5.90        1.5815    5   3   1         8
                58.97          2.76        1.5663    6   0   0         2
                59.18         11.59        1.5613    3   5   1         8
                59.76          2.93        1.5476    2   2   6         8
                60.40          1.74        1.5327    2   5   3         8
                60.49          2.82        1.5306    5   3   2         8
                60.51          6.31        1.5299    5   0   4         4
                60.81          3.36        1.5232    0   6   0         2
                61.45          5.90        1.5089    5   1   4         8
                62.61          1.78        1.4836    4   2   5         8
                62.65          1.87        1.4828    1   5   4         8
                63.21          4.26        1.4711    2   4   5         8
                63.39          3.19        1.4673    6   2   1         8
                63.59          3.11        1.4632    0   6   2         4
                64.29          1.24        1.4489    2   6   0         4
                64.45          1.57        1.4458    1   6   2         8
                64.74          4.36        1.4399    3   5   3         8
                65.28          1.11        1.4293    4   5   1         8
                65.97          1.20        1.4160    2   1   7         8
                67.32          2.21        1.3909    4   4   4         8
                68.76          2.60        1.3652    6   2   3         8
                69.41          1.77        1.3541    3   5   4         8
                69.87          1.98        1.3462    6   0   4         4
                69.99          3.73        1.3442    4   2   6         8
                70.51          1.24        1.3356    1   3   7         8
                72.48          1.72        1.3041    1   0   8         4
                72.71          1.34        1.3005    3   2   7         8
                73.19          1.71        1.2932    4   4   5         8
                73.33          1.25        1.2911    1   1   8         8
                73.91          1.18        1.2823    6   4   1         8
                74.16          1.42        1.2786    7   2   1         8
                75.07          1.90        1.2654    0   2   8         4
                76.07          1.87        1.2513    7   2   2         8
                76.22          1.18        1.2490    2   7   1         8
                76.71          1.12        1.2424    7   1   3         8
                77.23          2.16        1.2353    5   2   6         8
                78.36          3.72        1.2203    7   3   1         8
                80.13          1.23        1.1977    4   4   6         8
                81.08          2.45        1.1860    7   1   4         8
                81.23          1.77        1.1842    2   7   3         8
                82.03          1.76        1.1748    3   7   2         8
                83.31          1.55        1.1599    6   4   4         8
                83.78          3.32        1.1546    5   6   2         8
                84.14          1.51        1.1506    7   4   1         8
                84.14          2.50        1.1506    0   6   6         4
                84.30          2.09        1.1487    4   0   8         4
                85.02          1.96        1.1409    0   4   8         4
                85.61          1.28        1.1346    4   7   1         8
                85.79          1.83        1.1326    1   4   8         8
                86.24          2.22        1.1279    2   5   7         8
                87.12          1.24        1.1187    5   4   6         8
                88.39          2.07        1.1059    8   1   3         8
                88.59          1.19        1.1039    2   8   1         8
                89.39          2.31        1.0961    5   3   7         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.