Hematite-proto
Gualtieri A, Venturelli P
American Mineralogist 84 (1999) 895-904
In situ study of the goethite-hematite phase transformation by real time
synchrotron powder diffraction
Sample at T = 517 C
_database_code_amcsd 0002229
5.0258 5.0258 13.709 90 90 120 R-3c
atom     x    y     z occ Uiso
Fe       0    0 .3537 .95 .059
H    -.146 .321 -.142 .01  .07
O     .323    0   .25     .060