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

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ARGENTITE

1, t-cuprite, at 250'C, f-acanthite

Ag(2)S


Cubic  P n3  Z = 2

Pn3

5 .6 .1992

Ref.Str.:

         Wyckoff R.W.G. (1963)

         * Crystal Structures, 1, 331-332

                   Initial data from BDM-file 

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

             a =   4.88     alpha =   90.0 
             b =   4.88     beta  =   90.0 
             c =   4.88     gamma =   90.0 

    Unit cell volume (cub. angs.) =   116.21

    Molar volume ( cub.cm/mol.) =    35.0 

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

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

   1 0.25    0.25    0.25     0.0    Ag    = 1.00
   2 0.0     0.0     0.0      0.0    S     = 1.00


  Co-ordinates for all atomic positions :

   No       NoP      x/a        y/b       z/c 

     1       1     0.25       0.25       0.25  
     2       2     0.0        0.0        0.0   
     3       1     0.75       0.75       0.25  
     4       1     0.75       0.25       0.75  
     5       1     0.25       0.75       0.75  
     6       2     0.5        0.5        0.5   


X-ray density (g/cm cub.)   =      7.08

MU (1/cm) =    1425.167    Mass attenuation coefficient (cm**2/g) =    201.323

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

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

    1    Ag                  1.356        0
    2    S                   0.348        0

  X-ray diffraction powder data (II),  X-Ray W.L. =   1.54056(angs.):

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

    1   1   1   0 12.899  25.797   0.145   37.28   12       26.2     2268.2
    2   1   1   1 15.866  31.733   0.177   23.97    8      158.0    35463.7
    3   2   0   0 18.402  36.805   0.205   17.35    6      128.8    12786.6
    4   1   1   2 22.745  45.491   0.251   10.82   24       20.5      808.5
    5   2   2   0 26.516  53.032   0.29     7.63   12      151.0    15456.8
    6   2   2   1 28.264  56.528   0.307    6.6    24        0.0        0.0
    7   1   3   0 29.944  59.887   0.324    5.8    12       18.1      168.6
    8   3   1   0 29.944  59.887   0.324    5.8    12       18.1      168.6
    9   1   1   3 31.568  63.136   0.34     5.16   24      121.6    13556.9
   10   2   2   2 33.147  66.294   0.355    4.64    8      101.4     2828.3
   11   1   2   3 36.2    72.399   0.383    3.88   24       16.7      193.0
   12   3   2   1 36.2    72.399   0.383    3.88   24       16.7      193.0
   13   4   0   0 39.152  78.304   0.41     3.37    6      125.6     2359.1
   14   2   2   3 40.603  81.205   0.422    3.18   24        0.0        0.0
   15   1   1   4 42.042  84.084   0.435    3.03   24       15.8      134.7
   16   3   3   0 42.042  84.084   0.435    3.03   12       15.8       67.4
   17   3   3   1 43.474  86.948   0.447    2.92   24      103.8     5589.6
   18   2   4   0 44.902  89.805   0.458    2.83   12       86.8     1895.3
   19   4   2   0 44.902  89.805   0.458    2.83   12       86.8     1895.3


  X-ray diffraction powder data (I)...X-Ray wave length =  1.54056 (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   1   1   0  12.899  25.797  3.45068     2268.2      6.4      6.4     5.6
    2   1   1   1  15.866  31.733  2.81747    35463.7    100.0    100.0     5.6
    3   2   0   0  18.402  36.805  2.44       12786.6     36.1     35.9     5.7
    4   1   1   2  22.745  45.491  1.99225      808.5      2.3      2.2     5.7
    5   2   2   0  26.516  53.032  1.72534    15456.8     43.6     42.6     5.8
    6   1   1   3  31.568  63.136  1.47138    13556.9     38.2     36.8     5.9
    7   2   2   2  33.147  66.294  1.40873     2828.3      8.0      7.6     5.9
    8   1   2   3  36.2    72.399  1.30423      386.1      1.1      1.0     5.9
    9   4   0   0  39.152  78.304  1.22        2359.1      6.7      6.2     6.0
   10   3   3   1  43.474  86.948  1.11955     5589.6     15.8     14.5     6.1
   11   2   4   0  44.902  89.805  1.0912      3790.5     10.7      9.7     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)