Hematite

Fe₂O₃

Blake, R. L.Hessevick, R. E.Zoltai, T.Finger, L. W.

American Mineralogist (1966) 51, 123-129

a=5.038Å   b=5.038Å   c=13.772Å

α=90°   β=90°   γ=120°