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 = 313 C
_database_code_amcsd 0002228
5.0145 5.0145 13.692 90 90 120 R-3c
atom    x    y     z occ Uiso
Fe      0    0 .3531 .88 .053
H    -.20 .322 -.136 .01  .06
O    .316    0   .25     .054