COL  ICSD Collection Code 38126
 DATE Recorded Sep 24, 1986; updated Jan 19, 1999
 NAME Silicon oxide
 MINR Tridymite 2H substructure - synthetic
 FORM Si O2
      = O2 Si
 TITL X-ray study of tridymite
 REF  Mineralogical Journal (Japan)
      MJTOA 4 (1964) 115-130
 AUT  Sato M
 CELL a=5.030 b=5.030 c=8.220 à=90.0 á=90.0 ç=120.0
      V=180.1 D=2.20 Z=4
 SGR  P 63/m m c    (194) - hexagonal
 CLAS 6/mmm (Hermann-Mauguin) - D6h (Schoenflies)
 PRS  hP12
 ANX  AX2
 PARM Atom__No OxStat  Wyck ---X--- ---Y--- ---Z---  -SOF-
      Si     1  4.000    4f  1/3     2/3     0.4375
      O      1 -2.000    2c  1/3     2/3     1/4
      O      2 -2.000    6g  1/2     0.      1/2
 WYCK g f c
 REM  M PDF 18-1169 (supersructure)
 TEST No R value given in the paper. (Code 51)
 TEST At least one temperature factor missing in the paper. (Code 53)