COL  ICSD Collection Code 40093
 DATE Recorded Jun 26, 1998
 NAME Iron dialuminium oxide
 MINR Hercynite - synthetic at 1323 K for 4 d, then 1123 K for 5 d
 MINR Spinel group
 FORM Fe Al2 O4
      = Al2 Fe O4
 TITL X-ray powder diffraction profile refinement of synthetic hercynite
 REF  American Mineralogist
      AMMIA 69 (1984) 937-942
 AUT  Hill R J
 CELL a=8.156 b=8.156 c=8.156 à=90.0 á=90.0 ç=90.0
      V=542.5 D=4.25 Z=8
 SGR  F d -3 m Z    (227) - cubic
 CLAS m-3m  (Hermann-Mauguin) - Oh  (Schoenflies)
 PRS  cF56
 ANX  AB2X4
 PARM Atom__No OxStat  Wyck ---X--- ---Y--- ---Z---  -SOF-
      Fe     1  2.000    8a  1/8     1/8     1/8       0.837
      Al     1  3.000    8a  1/8     1/8     1/8       0.163(5)
      Fe     2  2.000   16d  1/2     1/2     1/2       0.0815(25)
      Al     2  3.000   16d  1/2     1/2     1/2       0.9185
      O      1 -2.000   32e  0.2633  0.2633  0.2633
 WYCK e d a
 ITF  Fe  1   B=0.56(3)
 ITF  Al  1   B=0.56(3)
 ITF  Fe  2   B=0.44(3)
 ITF  Al  2   B=0.44(3)
 ITF  O   1   B=1.07(5)
 REM  XDP (X-ray diffraction from a powder)
 REM  RVP
 REM  M PDF 34-192, R(Bragg)=0.0125
 RVAL 0.078
 TEST Calculated density unusual but tolerable. (Code 23)