COL  ICSD Collection Code 200146
 DATE Recorded Jan 1, 1980; updated May 26, 1987
 NAME Hexapotassium hexaniobium tetragermanium oxide
 FORM K6 Nb6 Ge4 O26
      = Ge4 K6 Nb6 O26
 TITL Etude du comportement du germanium dans les structures a tunnels 
      de section pentagonale: Les silicogermanates K6 Nb6 Gex Si4-x O26
 REF  Revue de Chimie Minerale
      RVCMA 14 (1977) 311-317
 AUT  Choisnet J, Nguyen˙N, Raveau˙B
 CELL a=9.188 b=9.188 c=8.123 à=90.0 á=90.0 ç=120.0
      V=593.9 Z=1
 SGR  P -6 2 m      (189) - hexagonal
 CLAS -6m2  (Hermann-Mauguin) - D3h (Schoenflies)
 PRS  hP42
 ANX  A2B3C3X13
 PARM Atom__No OxStat  Wyck ---X--- ---Y--- ---Z---  -SOF-
      K      1  1.000    3g  0.61    0.      1/2
      K      2  1.000    3f  0.599   0.      0.
      Ge     1  4.000    4h  1/3     2/3     0.219
      Nb     1  5.000    6i  0.232   0.      0.239
      O      1 -2.000    2c  1/3     2/3     0.
      O      2 -2.000    3f  0.228   0.      0.
      O      3 -2.000    6i  0.831   0.      0.292
      O      4 -2.000   12l  0.478   0.166   0.28
      O      5 -2.000    3g  0.256   0.      1/2
 WYCK l i2 h g2 f2 c
 ITF  K   1   B=2.9
 ITF  K   2   B=0.3
 ITF  Ge  1   B=2.4
 ITF  Nb  1   B=0.6
 ITF  O   1   B=0.1
 ITF  O   2   B=0.2
 ITF  O   3   B=0.2
 ITF  O   4   B=0.2
 ITF  O   5   B=2.9
 RVAL 0.088
 TEST At least one temperature factor is implausible or meaningless but 
      agrees with the value given in the paper. (Code 52)