Institute of Experimental Mineralogy
                 Russian Academy of Sciences
     -------------------------------------------------
           142432, Chernogolovka, Moscow district
             A.V. Chichagov  +7(496)52-22320

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          ***      W W W - X R A Y P O L       ***
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GLAUCOCHROITE

2, t-monticellite, at 300'C, f-monticellite

CaMnSiO(4)


Orthorhombic  P bnm  Z = 4

R =0.024          NR =230

1 .3 .1990

Ref.Str.:

         G.A. Lager, E.P. Meagher (1978)

         * Amer. Mineral., 63, 365-377

                   Initial data from BDM-file 

   Lattice parameters (cub. angs.,degr.):

             a =   4.924    alpha =   90.0 
             b =  11.178    beta  =   90.0 
             c =   6.504    gamma =   90.0 

    Unit cell volume (cub. angs.) =   357.98

    Molar volume ( cub.cm/mol.) =    53.91

  Co-ordinates, thermal parameters, occupation for atomic positions:

NoP   x/a     y/b     z/c    B(j)   atom  / occupation

   1 0.0     0.0     0.0      1.16   Mn    = 1.00
   2 0.9797  0.2789  0.25     0.85   Ca    = 1.00
   3 0.415   0.0875  0.25     0.8    Si    = 1.00
   4 0.7452  0.0841  0.25     1.27   O     = 1.00
   5 0.2277  0.4542  0.25     0.92   O     = 1.00
   6 0.2827  0.153   0.05     1.6    O     = 1.00


  Co-ordinates for all atomic positions :

   No       NoP      x/a        y/b       z/c 

     1       1     0.0        0.0        0.0   
     2       2     0.9797     0.2789     0.25  
     3       3     0.415      0.0875     0.25  
     4       4     0.7452     0.0841     0.25  
     5       5     0.2277     0.4542     0.25  
     6       6     0.2827     0.153      0.05  
     7       2     0.0203     0.7211     0.75  
     8       3     0.585      0.9125     0.75  
     9       4     0.2548     0.9159     0.75  
    10       5     0.7723     0.5458     0.75  
    11       6     0.7173     0.847      0.95  
    12       1     0.0        0.0        0.5   
    13       6     0.7173     0.847      0.55  
    14       6     0.2827     0.153      0.45  
    15       1     0.5        0.5        0.0   
    16       2     0.5203     0.7789     0.25  
    17       3     0.085      0.5875     0.25  
    18       4     0.7548     0.5841     0.25  
    19       5     0.2723     0.9542     0.25  
    20       6     0.2173     0.653      0.05  
    21       2     0.4797     0.2211     0.75  
    22       3     0.915      0.4125     0.75  
    23       4     0.2452     0.4159     0.75  
    24       5     0.7277     0.0458     0.75  
    25       6     0.7827     0.347      0.95  
    26       1     0.5        0.5        0.5   
    27       6     0.7827     0.347      0.55  
    28       6     0.2173     0.653      0.45  


X-ray density (g/cm cub.)   =      3.47

MU (1/cm) =     250.384    Mass attenuation coefficient (cm**2/g) =     72.149

 Selected interatomic distances (cation-anion,anion-anion):

 NoP    Atom              Rad.sph.      C.N.    Distance     NoP N.
                           (angs.)               (angs.)

    1    Mn                  2.724        6
                                                 2.2587       4
                                                 2.229        6
                                                 2.2587       4
                                                 2.229        6
                                                 2.1688       5
                                                 2.1688       5
    2    Ca                  2.88         6
                                                 2.4647       4
                                                 2.3089       5
                                                 2.4287       6
                                                 2.4287       6
                                                 2.3082       6
                                                 2.3082       6
    3    Si                  2.1          4
                                                 1.6263       4
                                                 1.6287       6
                                                 1.6287       6
                                                 1.6474       5
    4    O                   3.264        6
                                                 3.0479       6
                                                 2.7334       6
                                                 3.0479       6
                                                 2.7334       6
                                                 2.974        5
                                                 2.7442       5
    5    O                   3.264        6
                                                 2.974        4
                                                 2.7442       4
                                                 2.5754       6
                                                 3.1693       6
                                                 3.1693       6
                                                 2.5754       6
    6    O                   3.264        5
                                                 2.7334       4
                                                 3.0479       4
                                                 2.6016       6
                                                 2.5754       5
                                                 3.1693       5

  X-ray diffraction powder data (II),  X-Ray W.L. =   1.78892(angs.):

  No   H   K   L   Theta 2*Theta    S       LPG   MF        F          I int.
                    ( degree )                                         *100

    1   0   2   0  9.209  18.418   0.089   75.16    2       66.7      522.1
    2   1   1   0 11.449  22.898   0.111   47.87    4       30.2      136.2
    3   0   2   1 12.182  24.363   0.118   42.04    4       42.2      234.0
    4   1   0   1 13.17   26.34    0.127   35.67    4       30.6      104.4
    5   1   1   1 13.974  27.948   0.135   31.46    8       40.3      319.5
    6   1   2   0 14.01   28.021   0.135   31.29    4       33.7      110.7
    7   0   0   2 15.965  31.93    0.154   23.65    2       32.9       39.9
    8   1   2   1 16.167  32.333   0.156   23.02    8       20.3       59.4
    9   1   3   0 17.52   35.04    0.168   19.33    4      118.2      842.3
   10   0   2   2 18.555  37.111   0.178   17.04    4       69.0      253.2
   11   0   4   0 18.668  37.335   0.179   16.82    2       59.2       91.9
   12   1   3   1 19.327  38.655   0.185   15.57    8       80.8      634.4
   13   1   1   2 19.828  39.656   0.19    14.72    8      112.1     1153.5
   14   0   4   1 20.388  40.776   0.195   13.83    4       57.7      144.0
   15   2   0   0 21.303  42.607   0.203   12.54    2       63.2       78.2
   16   1   2   2 21.495  42.99    0.205   12.29    8       41.3      130.9
   17   1   4   0 21.594  43.189   0.206   12.16    4       52.7      105.4
   18   2   1   0 21.84   43.68    0.208   11.86    4       41.5       63.6
   19   1   4   1 23.134  46.269   0.22    10.41    8        6.4        2.6
   20   2   1   1 23.367  46.734   0.222   10.18    8       31.4       62.5
   21   2   2   0 23.39   46.781   0.222   10.15    4       15.7        7.8
   22   1   3   2 24.065  48.13    0.228    9.52    8       46.9      130.9
   23   2   2   1 24.843  49.687   0.235    8.86    8       18.8       19.5
   24   0   4   2 24.962  49.925   0.236    8.76    4       28.4       22.1
   25   2   3   0 25.814  51.628   0.243    8.12    4       17.7        7.9
   26   1   5   0 26.066  52.132   0.246    7.94    4       53.0       69.5
   27   0   2   3 26.265  52.53    0.247    7.8     4        8.4        1.7
   28   1   0   3 26.795  53.589   0.252    7.46    4       16.2        6.1
   29   2   0   2 27.109  54.217   0.255    7.26    4       10.0        2.3
   30   2   3   1 27.171  54.343   0.255    7.22    8        3.2        0.5
   31   1   1   3 27.248  54.496   0.256    7.18    8       37.3       62.4
   32   1   4   2 27.352  54.704   0.257    7.11    8        3.9        0.7
   33   1   5   1 27.414  54.829   0.257    7.08    8       22.8       23.1
   34   2   1   2 27.558  55.117   0.259    6.99    8       16.3       11.6
   35   1   2   3 28.578  57.157   0.267    6.44    8       28.0       31.4
   36   0   6   0 28.693  57.386   0.268    6.38    2       16.8        2.8
   37   2   2   2 28.879  57.759   0.27     6.29    8      126.6      629.4
   38   2   4   0 28.96   57.919   0.271    6.25    4      110.3      237.2
   39   0   6   1 29.962  59.924   0.279    5.79    4       66.8       80.6
   40   2   4   1 30.221  60.443   0.281    5.68    8       48.0       81.5
   41   1   3   3 30.712  61.425   0.285    5.48    8       62.7      134.5
   42   1   6   0 30.886  61.772   0.287    5.41    4       26.9       12.2
   43   2   3   2 31.0    62.001   0.288    5.37    8       11.0        4.1
   44   1   5   2 31.224  62.449   0.29     5.28    8       67.9      152.0
   45   0   4   3 31.478  62.957   0.292    5.19    4       68.6       76.3
   46   1   6   1 32.103  64.205   0.297    4.97    8        7.0        1.5
   47   2   5   0 32.713  65.427   0.302    4.77    4        1.3        0.0
   48   0   0   4 33.374  66.748   0.308    4.57    2      165.9      196.4
   49   3   1   0 33.422  66.844   0.308    4.56    4       65.4       60.8
   50   1   4   3 33.564  67.128   0.309    4.52    8       16.6        7.7
   51   0   6   2 33.595  67.19    0.309    4.51    4      140.4      277.6
   52   2   1   3 33.747  67.494   0.311    4.47    8       18.6        9.7
   53   2   4   2 33.839  67.678   0.311    4.44    8       47.0       61.3
   54   2   5   1 33.894  67.788   0.312    4.43    8       31.1       26.7
   55   3   0   1 34.197  68.395   0.314    4.35    4        8.2        0.9
   56   3   1   1 34.591  69.182   0.317    4.25    8       41.2       45.0
   57   3   2   0 34.609  69.218   0.317    4.24    4       30.6       12.4
   58   2   2   3 34.929  69.857   0.32     4.16    8       12.2        3.9
   59   0   2   4 34.953  69.906   0.32     4.16    4       44.4       25.6
   60   1   6   2 35.618  71.236   0.326    4.0     8        0.8        0.0
   61   3   2   1 35.76   71.519   0.327    3.97    8       25.6       16.2
   62   1   1   4 35.79   71.58    0.327    3.96    8       21.3       11.2
   63   1   7   0 36.076  72.152   0.329    3.9     4      106.4      137.9
   64   3   3   0 36.548  73.095   0.333    3.81    4       61.0       44.2
   65   2   3   3 36.86   73.72    0.335    3.75    8       13.2        4.1
   66   1   2   4 36.943  73.885   0.336    3.73    8        3.6        0.3
   67   2   6   0 37.019  74.039   0.337    3.72    4       15.5        2.8
   68   1   5   3 37.066  74.133   0.337    3.71    8       12.3        3.5
   69   1   7   1 37.207  74.415   0.338    3.68    8        5.6        0.7
   70   2   5   2 37.33   74.659   0.339    3.66    8       19.5        8.7
   71   3   3   1 37.674  75.348   0.342    3.6     8       31.8       22.8
   72   3   1   2 38.0    76.0     0.344    3.54    8       56.7       71.1
   73   2   6   1 38.14   76.281   0.345    3.52    8       19.6        8.4
   74   1   3   4 38.835  77.671   0.351    3.41    8       71.5      108.8
   75   3   2   2 39.129  78.258   0.353    3.37    8       60.2       76.2
   76   3   4   0 39.198  78.397   0.353    3.36    4       45.3       21.5
   77   0   6   3 39.274  78.548   0.354    3.35    4       41.3       17.9
   78   2   4   3 39.504  79.007   0.356    3.32    8       24.9       12.9
   79   0   4   4 39.527  79.054   0.356    3.32    4       54.6       30.8
   80   0   8   0 39.804  79.607   0.358    3.28    2       34.8        6.2
   81   3   4   1 40.3    80.601   0.362    3.22    8       32.5       21.2
   82   1   7   2 40.536  81.072   0.363    3.19    8        9.0        1.6
   83   0   8   1 40.902  81.803   0.366    3.15    4        1.5        0.0
   84   3   3   2 40.991  81.982   0.367    3.14    8       17.2        5.8
   85   1   6   3 41.192  82.383   0.368    3.12    8       16.7        5.5
   86   2   0   4 41.242  82.484   0.369    3.11    4       67.2       43.9
   87   1   4   4 41.442  82.884   0.37     3.09    8       16.0        5.0
   88   2   6   2 41.448  82.895   0.37     3.09    8       49.8       47.8
   89   2   1   4 41.612  83.224   0.371    3.08    8       22.1        9.4
   90   1   8   0 41.715  83.431   0.372    3.07    4        3.9        0.1
   91   2   7   0 41.885  83.771   0.373    3.05    4       16.8        2.7
   92   3   5   0 42.537  85.073   0.378    2.99    4       20.2        3.8
   93   2   2   4 42.718  85.436   0.379    2.98    8        7.3        1.0
   94   1   8   1 42.804  85.608   0.38     2.97    8        6.1        0.7
   95   2   5   3 42.837  85.674   0.38     2.97    8       28.0       14.5
   96   2   7   1 42.973  85.947   0.381    2.96    8        7.6        1.1
   97   3   0   3 43.119  86.238   0.382    2.94    4       26.7        6.6
   98   3   1   3 43.487  86.973   0.385    2.92    8       23.9       10.4
   99   3   4   2 43.572  87.144   0.385    2.91    8       22.0        8.8
  100   3   5   1 43.623  87.246   0.386    2.91    8       12.7        2.9
  101   0   8   2 44.166  88.333   0.389    2.87    4       63.0       35.7
  102   2   3   4 44.555  89.109   0.392    2.85    8       12.8        2.9
  103   3   2   3 44.588  89.176   0.392    2.85    8       16.1        4.6
  104   1   5   4 44.753  89.506   0.394    2.84    8       37.7       25.2
  105   0   2   5 44.911  89.821   0.395    2.83    4       31.5        8.8


  X-ray diffraction powder data (I)...X-Ray wave length =  1.78892 (angs.):

  No   H   K   L   Theta 2*Theta    d           I int   I int.n.  I p.h.n.   H(Si)
                    ( degree )   (angstrem)     *100                         *100

    1   0   2   0   9.209  18.418  5.589        522.1     45.3     46.1     5.6
    2   1   1   0  11.449  22.898  4.50617      136.2     11.8     12.0     5.6
    3   0   2   1  12.182  24.363  4.23893      234.0     20.3     20.6     5.6
    4   1   0   1  13.17   26.34   3.92583      104.4      9.1      9.2     5.6
    5   1   1   1  13.974  27.948  3.70403      319.5     27.7     28.0     5.6
    6   1   2   0  14.01   28.021  3.69465      110.7      9.6      9.7     5.6
    7   0   0   2  15.965  31.93   3.252         39.9      3.5      3.5     5.6
    8   1   2   1  16.167  32.333  3.21251       59.4      5.2      5.2     5.6
    9   1   3   0  17.52   35.04   2.97122      842.3     73.0     73.3     5.7
   10   0   2   2  18.555  37.111  2.81081      253.2     22.0     22.0     5.7
   11   0   4   0  18.668  37.335  2.7945        91.9      8.0      8.0     5.7
   12   1   3   1  19.327  38.655  2.70256      634.4     55.0     55.1     5.7
   13   1   1   2  19.828  39.656  2.63701     1153.5    100.0    100.0     5.7
   14   0   4   1  20.388  40.776  2.56754      144.0     12.5     12.5     5.7
   15   2   0   0  21.303  42.607  2.462         78.2      6.8      6.8     5.7
   16   1   2   2  21.495  42.99   2.44109      130.9     11.4     11.3     5.7
   17   1   4   0  21.594  43.189  2.43038      105.4      9.1      9.1     5.7
   18   2   1   0  21.84   43.68   2.40437       63.6      5.5      5.5     5.7
   19   2   1   1  23.367  46.734  2.2552        70.3      6.1      6.0     5.7
   20   1   3   2  24.065  48.13   2.19353      130.9     11.3     11.2     5.7
   21   2   2   1  24.843  49.687  2.12896       19.5      1.7      1.7     5.7
   22   0   4   2  24.962  49.925  2.11946       22.1      1.9      1.9     5.7
   23   1   5   0  26.066  52.132  2.03562       69.5      6.0      5.9     5.8
   24   1   1   3  27.248  54.496  1.95365       62.4      5.4      5.3     5.8
   25   1   5   1  27.414  54.829  1.94269       23.1      2.0      2.0     5.8
   26   2   1   2  27.558  55.117  1.93333       11.6      1.0      1.0     5.8
   27   1   2   3  28.578  57.157  1.86985       31.4      2.7      2.7     5.8
   28   2   2   2  28.879  57.759  1.85201      629.4     54.6     53.4     5.8
   29   2   4   0  28.96   57.919  1.84733      237.2     20.6     20.1     5.8
   30   0   6   1  29.962  59.924  1.79098       80.6      7.0      6.8     5.8
   31   2   4   1  30.221  60.443  1.77704       81.5      7.1      6.9     5.8
   32   1   3   3  30.712  61.425  1.75134      134.5     11.7     11.4     5.8
   33   1   6   0  30.886  61.772  1.74245       12.2      1.1      1.0     5.8
   34   1   5   2  31.224  62.449  1.72546      152.0     13.2     12.8     5.8
   35   0   4   3  31.478  62.957  1.71295       76.3      6.6      6.4     5.9
   36   0   0   4  33.374  66.748  1.626        196.4     17.0     16.4     5.9
   37   3   1   0  33.422  66.844  1.62392       60.8      5.3      5.1     5.9
   38   0   6   2  33.595  67.19   1.61653      277.6     24.1     23.2     5.9
   39   2   4   2  33.839  67.678  1.60625       61.3      5.3      5.1     5.9
   40   2   5   1  33.894  67.788  1.60396       26.7      2.3      2.2     5.9
   41   3   1   1  34.591  69.182  1.57555       57.3      5.0      4.8     5.9
   42   0   2   4  34.953  69.906  1.56127       29.5      2.6      2.5     5.9
   43   3   2   1  35.76   71.519  1.5306        16.2      1.4      1.3     5.9
   44   1   7   0  36.076  72.152  1.51898      137.9     12.0     11.4     5.9
   45   3   3   0  36.548  73.095  1.50206       44.2      3.8      3.7     6.0
   46   3   3   1  37.674  75.348  1.46353       22.8      2.0      1.9     6.0
   47   3   1   2  38.0    76.0    1.45285       71.1      6.2      5.8     6.0
   48   1   3   4  38.835  77.671  1.42638      108.8      9.4      8.9     6.0
   49   3   2   2  39.129  78.258  1.41738       76.2      6.6      6.2     6.0
   50   3   4   0  39.198  78.397  1.41527       21.5      1.9      1.8     6.0
   51   0   6   3  39.274  78.548  1.41298       17.9      1.5      1.5     6.0
   52   0   4   4  39.527  79.054  1.40541       43.7      3.8      3.6     6.0
   53   3   4   1  40.3    80.601  1.38291       21.2      1.8      1.7     6.1
   54   2   0   4  41.242  82.484  1.3568        43.9      3.8      3.6     6.1
   55   2   6   2  41.448  82.895  1.35128       52.8      4.6      4.3     6.1
   56   2   5   3  42.837  85.674  1.31554       14.5      1.3      1.2     6.1
   57   0   8   2  44.166  88.333  1.28377       35.7      3.1      2.8     6.2
   58   1   5   4  44.753  89.506  1.27045       25.2      2.2      2.0     6.2

Reference:
Chichagov A.V. et al.
Information-Calculating System on Crystal Structure Data of Minerals
(MINCRYST)
- Kristallographiya, v.35, n.3, 1990, p.610-616 (in Russian)