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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FORSTERITE

23, t-olivine, f-olivine, s-forsterite

(Fe,Mg,Mn,Ca)(2)SiO(4)


Orthorhombic  P bnm  Z = 4

R =0.08          NR =924

26 .10 .1989

Ref.Str.:

         J.D. Birle, G.V. Gibbs, P.B. Moore (1968)

         * Amer. Mineral., 53, 807-824

Reserv:

         In original - hyalosiderite[1].

                   Initial data from BDM-file 

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

             a =   4.785    alpha =   90.0 
             b =  10.325    beta  =   90.0 
             c =   6.038    gamma =   90.0 

    Unit cell volume (cub. angs.) =   298.31

    Molar volume ( cub.cm/mol.) =    44.92

  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      0.32   Mg    = 0.54, Fe    = 0.46, Mn    = 0.01
   2 0.986   0.2788  0.25     0.37   Mg    = 0.54, Fe    = 0.46, Mn    = 0.01
   3 0.4284  0.0959  0.25     0.19   Si    = 1.00
   4 0.7657  0.0943  0.25     0.4    O     = 1.00
   5 0.2164  0.4508  0.25     0.56   O     = 1.00
   6 0.2826  0.1637  0.0344   0.5    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     0.986      0.2788     0.25  
     3       3     0.4284     0.0959     0.25  
     4       4     0.7657     0.0943     0.25  
     5       5     0.2164     0.4508     0.25  
     6       6     0.2826     0.1637     0.0344
     7       2     0.014      0.7212     0.75  
     8       3     0.5716     0.9041     0.75  
     9       4     0.2343     0.9057     0.75  
    10       5     0.7836     0.5492     0.75  
    11       6     0.7174     0.8363     0.9656
    12       1     0.0        0.0        0.5   
    13       6     0.7174     0.8363     0.5343
    14       6     0.2826     0.1637     0.4656
    15       1     0.5        0.5        0.0   
    16       2     0.514      0.7788     0.25  
    17       3     0.0716     0.5959     0.25  
    18       4     0.7343     0.5943     0.25  
    19       5     0.2836     0.9508     0.25  
    20       6     0.2174     0.6637     0.0344
    21       2     0.486      0.2212     0.75  
    22       3     0.9284     0.4041     0.75  
    23       4     0.2657     0.4057     0.75  
    24       5     0.7164     0.0492     0.75  
    25       6     0.7826     0.3363     0.9656
    26       1     0.5        0.5        0.5   
    27       6     0.7826     0.3363     0.5343
    28       6     0.2174     0.6637     0.4656


X-ray density (g/cm cub.)   =      3.78

MU (1/cm) =     177.986    Mass attenuation coefficient (cm**2/g) =     47.064

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

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

    1   Mg   ,Fe   ,Mn       2.724        6
                                                 2.1175       4
                                                 2.1746       6
                                                 2.1175       4
                                                 2.1746       6
                                                 2.0922       5
                                                 2.0922       5
    2   Mg   ,Fe   ,Mn       2.724        6
                                                 2.1772       4
                                                 2.0907       5
                                                 2.2634       6
                                                 2.2634       6
                                                 2.0608       6
                                                 2.0608       6
    3    Si                  2.1          4
                                                 1.6137       4
                                                 1.6348       6
                                                 1.6348       6
                                                 1.6501       5
    4    O                   3.264       12
                                                 2.8859       6
                                                 2.7479       6
                                                 3.1776       6
                                                 3.1776       6
                                                 2.8859       6
                                                 2.7479       6
                                                 2.8872       5
                                                 2.7414       5
                                                 3.0638       5
                                                 3.0638       5
                                                 3.0328       6
                                                 3.0328       6
    5    O                   3.264       10
                                                 3.2535       6
                                                 3.2535       6
                                                 2.8872       4
                                                 2.7414       4
                                                 2.5545       6
                                                 3.0638       4
                                                 3.0638       4
                                                 2.9419       6
                                                 2.9419       6
                                                 2.5545       6
    6    O                   3.264       10
                                                 2.7479       4
                                                 2.8859       4
                                                 3.2535       5
                                                 3.1776       4
                                                 2.6042       6
                                                 2.5545       5
                                                 3.0328       4
                                                 2.9419       5
                                                 3.012        6
                                                 3.012        6

  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  9.977  19.955   0.097   63.71    2       29.3      122.5
    2   1   1   0 11.89   23.779   0.115   44.24    4        9.0       16.1
    3   0   2   1 13.177  26.354   0.127   35.63    4       39.8      253.7
    4   1   0   1 13.799  27.597   0.133   32.32    4       24.6       88.0
    5   1   1   1 14.7    29.4     0.142   28.24    8       38.8      381.8
    6   1   2   0 14.766  29.533   0.142   27.97    4       25.9       84.6
    7   1   2   1 17.146  34.291   0.165   20.26    8       16.8       51.3
    8   0   0   2 17.234  34.468   0.166   20.03    2       45.8       94.4
    9   1   3   0 18.671  37.342   0.179   16.81    4      101.3      775.0
   10   0   2   2 20.073  40.146   0.192   14.32    4       48.0      148.6
   11   0   4   0 20.275  40.549   0.194   14.0     2       34.4       37.3
   12   1   3   1 20.656  41.311   0.197   13.43    8       75.2      683.7
   13   1   1   2 21.154  42.307   0.202   12.74    8       91.6      960.6
   14   2   0   0 21.954  43.908   0.209   11.72    2       51.2       69.0
   15   0   4   1 22.139  44.278   0.211   11.5     4       48.2      120.1
   16   2   1   0 22.567  45.134   0.215   11.01    4       39.9       78.6
   17   1   2   2 23.006  46.011   0.218   10.54    8       46.9      208.3
   18   1   4   0 23.187  46.373   0.22    10.36    4       59.2      162.9
   19   2   1   1 24.291  48.581   0.23     9.32    8       34.5      100.0
   20   2   2   0 24.334  48.668   0.23     9.28    4        7.2        2.2
   21   1   4   1 24.877  49.754   0.235    8.83    8        0.7        0.0
   22   1   3   2 25.861  51.723   0.244    8.08    8       27.1       53.5
   23   2   2   1 25.968  51.937   0.245    8.01    8       11.1        8.8
   24   2   3   0 27.085  54.171   0.255    7.27    4       17.4        9.9
   25   0   4   2 27.124  54.248   0.255    7.25    4       26.9       23.6
   26   1   5   0 28.149  56.298   0.264    6.66    4       36.5       39.9
   27   0   2   3 28.489  56.979   0.267    6.49    4        2.1        0.1
   28   2   0   2 28.491  56.982   0.267    6.48    4       16.2        7.7
   29   2   3   1 28.608  57.216   0.268    6.43    8        1.2        0.1
   30   1   0   3 28.825  57.649   0.27     6.32    4       10.6        3.2
   31   2   1   2 29.001  58.002   0.271    6.23    8       12.3        8.5
   32   1   1   3 29.331  58.661   0.274    6.07    8       35.4       68.5
   33   1   4   2 29.521  59.043   0.275    5.99    8        4.4        1.1
   34   1   5   1 29.635  59.271   0.276    5.93    8       30.6       50.0
   35   2   2   2 30.498  60.997   0.284    5.57    8      114.4      654.5
   36   2   4   0 30.647  61.295   0.285    5.51    4       90.1      201.0
   37   1   2   3 30.818  61.636   0.286    5.44    8       24.9       30.2
   38   0   6   0 31.318  62.635   0.291    5.25    2        8.4        0.8
   39   2   4   1 32.062  64.125   0.297    4.98    8       51.1      117.2
   40   0   6   1 32.716  65.433   0.302    4.77    4       76.6      125.8
   41   2   3   2 32.904  65.807   0.304    4.71    8       15.1        9.6
   42   1   3   3 33.21   66.421   0.306    4.62    8       62.1      160.4
   43   1   6   0 33.53   67.06    0.309    4.53    4       14.2        4.1
   44   1   5   2 33.854  67.709   0.311    4.44    8       50.2      100.7
   45   0   4   3 34.301  68.603   0.315    4.32    4       61.7       73.8
   46   3   1   0 34.572  69.144   0.317    4.25    4       44.2       37.3
   47   1   6   1 34.882  69.765   0.32     4.17    8        5.2        1.0
   48   2   5   0 34.903  69.805   0.32     4.17    4        8.1        1.2
   49   3   0   1 35.452  70.905   0.324    4.04    4       16.5        5.0
   50   3   1   1 35.906  71.812   0.328    3.94    8       35.0       43.4
   51   3   2   0 35.941  71.881   0.328    3.93    4       31.1       17.0
   52   2   1   3 35.957  71.914   0.328    3.93    8       23.0       18.6
   53   2   4   2 36.129  72.257   0.33     3.89    8       33.2       38.5
   54   2   5   1 36.231  72.463   0.33     3.87    8       31.5       34.5
   55   0   0   4 36.338  72.677   0.331    3.85    2      162.7      228.9
   56   1   4   3 36.423  72.846   0.332    3.83    8       11.1        4.2
   57   0   6   2 36.748  73.495   0.334    3.77    4      131.4      292.2
   58   3   2   1 37.254  74.508   0.338    3.67    8       19.2       12.2
   59   2   2   3 37.304  74.609   0.339    3.66    8       11.1        4.1
   60   0   2   4 38.124  76.248   0.345    3.52    4       21.5        7.4
   61   3   3   0 38.176  76.353   0.346    3.52    4       53.9       45.9
   62   1   6   2 38.816  77.631   0.35     3.42    8        7.1        1.5
   63   1   1   4 38.855  77.71    0.351    3.41    8        8.2        2.1
   64   1   7   0 39.388  78.776   0.355    3.33    4       89.7      120.6
   65   3   3   1 39.464  78.927   0.355    3.32    8       49.4       73.0
   66   2   3   3 39.513  79.026   0.356    3.32    8        7.0        1.5
   67   3   1   2 39.802  79.603   0.358    3.28    8       55.8       91.7
   68   2   6   0 39.812  79.624   0.358    3.28    4        2.9        0.1
   69   2   5   2 40.116  80.232   0.36     3.24    8       11.0        3.5
   70   1   2   4 40.169  80.338   0.361    3.23    8        8.6        2.1
   71   1   5   3 40.401  80.801   0.362    3.21    8       21.1       12.8
   72   1   7   1 40.665  81.33    0.364    3.18    8       11.7        3.9
   73   2   6   1 41.085  82.171   0.367    3.13    8       26.4       19.6
   74   3   2   2 41.108  82.216   0.368    3.13    8       63.4      113.0
   75   3   4   0 41.24   82.48    0.368    3.11    4       46.6       30.3
   76   1   3   4 42.338  84.676   0.376    3.01    8       66.3      118.9
   77   3   4   1 42.505  85.01    0.378    2.99    8       37.6       38.0
   78   2   4   3 42.554  85.107   0.378    2.99    8       28.1       21.2
   79   0   6   3 43.147  86.294   0.382    2.94    4       61.2       49.6
   80   3   3   2 43.269  86.538   0.383    2.93    8        0.8        0.0
   81   0   4   4 43.349  86.698   0.384    2.93    4       32.2       13.7
   82   0   8   0 43.872  87.743   0.387    2.89    2       28.5        5.3
   83   1   7   2 44.453  88.907   0.391    2.86    8       13.3        4.5
   84   2   0   4 44.478  88.956   0.392    2.86    4       56.8       41.3
   85   2   6   2 44.87   89.739   0.394    2.83    8       38.2       37.2
   86   2   1   4 44.908  89.816   0.395    2.83    8       23.8       14.4


  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   9.977  19.955  5.1625       122.5     12.8     13.0     5.6
    2   1   1   0  11.89   23.779  4.34144       16.1      1.7      1.7     5.6
    3   0   2   1  13.177  26.354  3.92381      253.7     26.4     26.8     5.6
    4   1   0   1  13.799  27.597  3.75017       88.0      9.2      9.3     5.6
    5   1   1   1  14.7    29.4    3.52487      381.8     39.8     40.2     5.6
    6   1   2   0  14.766  29.533  3.50938       84.6      8.8      8.9     5.6
    7   1   2   1  17.146  34.291  3.03412       51.3      5.3      5.4     5.7
    8   0   0   2  17.234  34.468  3.019         94.4      9.8      9.9     5.7
    9   1   3   0  18.671  37.342  2.79401      775.0     80.7     81.1     5.7
   10   0   2   2  20.073  40.146  2.60609      148.6     15.5     15.5     5.7
   11   0   4   0  20.275  40.549  2.58125       37.3      3.9      3.9     5.7
   12   1   3   1  20.656  41.311  2.53569      683.7     71.2     71.3     5.7
   13   1   1   2  21.154  42.307  2.47862      960.6    100.0    100.0     5.7
   14   2   0   0  21.954  43.908  2.3925        69.0      7.2      7.2     5.7
   15   0   4   1  22.139  44.278  2.37346      120.1     12.5     12.5     5.7
   16   2   1   0  22.567  45.134  2.33074       78.6      8.2      8.2     5.7
   17   1   2   2  23.006  46.011  2.28866      208.3     21.7     21.6     5.7
   18   1   4   0  23.187  46.373  2.27178      162.9     17.0     16.9     5.7
   19   2   1   1  24.291  48.581  2.17437      100.0     10.4     10.3     5.7
   20   1   3   2  25.861  51.723  2.05059       53.5      5.6      5.5     5.8
   21   2   3   0  27.085  54.171  1.96447        9.9      1.0      1.0     5.8
   22   0   4   2  27.124  54.248  1.96191       23.6      2.5      2.4     5.8
   23   1   5   0  28.149  56.298  1.89598       39.9      4.2      4.1     5.8
   24   1   1   3  29.331  58.661  1.82599       68.5      7.1      7.0     5.8
   25   1   5   1  29.635  59.271  1.8089        50.0      5.2      5.1     5.8
   26   2   2   2  30.498  60.997  1.76243      654.5     68.1     66.6     5.8
   27   2   4   0  30.647  61.295  1.75469      201.0     20.9     20.4     5.8
   28   1   2   3  30.818  61.636  1.74592       30.2      3.1      3.1     5.8
   29   2   4   1  32.062  64.125  1.68498      117.2     12.2     11.9     5.9
   30   0   6   1  32.716  65.433  1.65493      125.8     13.1     12.7     5.9
   31   1   3   3  33.21   66.421  1.63308      160.4     16.7     16.2     5.9
   32   1   5   2  33.854  67.709  1.60561      100.7     10.5     10.1     5.9
   33   0   4   3  34.301  68.603  1.5872        73.8      7.7      7.4     5.9
   34   3   1   0  34.572  69.144  1.5763        37.3      3.9      3.7     5.9
   35   3   1   1  35.906  71.812  1.52519       43.4      4.5      4.3     5.9
   36   2   1   3  35.957  71.914  1.52331       35.7      3.7      3.6     5.9
   37   2   4   2  36.129  72.257  1.51706       38.5      4.0      3.8     5.9
   38   2   5   1  36.231  72.463  1.51335       34.5      3.6      3.4     5.9
   39   0   0   4  36.338  72.677  1.5095       228.9     23.8     22.8     6.0
   40   0   6   2  36.748  73.495  1.49502      292.2     30.4     29.1     6.0
   41   3   2   1  37.254  74.508  1.47759       12.2      1.3      1.2     6.0
   42   3   3   0  38.176  76.353  1.44715       45.9      4.8      4.5     6.0
   43   1   7   0  39.388  78.776  1.40955      120.6     12.6     11.9     6.0
   44   3   3   1  39.464  78.927  1.40729       73.0      7.6      7.2     6.0
   45   3   1   2  39.802  79.603  1.3973        91.8      9.6      9.0     6.0
   46   1   5   3  40.401  80.801  1.38007       12.8      1.3      1.3     6.1
   47   3   2   2  41.108  82.216  1.36043      132.6     13.8     12.9     6.1
   48   3   4   0  41.24   82.48   1.35686       30.3      3.2      3.0     6.1
   49   1   3   4  42.338  84.676  1.32807      118.9     12.4     11.5     6.1
   50   3   4   1  42.505  85.01   1.32384       38.0      4.0      3.7     6.1
   51   2   4   3  42.554  85.107  1.32262       21.2      2.2      2.1     6.1
   52   0   6   3  43.147  86.294  1.30794       49.6      5.2      4.8     6.1
   53   0   4   4  43.349  86.698  1.30305       13.7      1.4      1.3     6.1
   54   2   0   4  44.478  88.956  1.27664       45.9      4.8      4.4     6.2
   55   2   6   2  44.87   89.739  1.26784       37.2      3.9      3.6     6.2
   56   2   1   4  44.908  89.816  1.26699       14.4      1.5      1.4     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)