chromic iron

from The Collaborative International Dictionary of English v.0.48

Chromite \Chro"mite\, n.
   1. (Min.) A black submetallic mineral consisting of oxide of
      chromium and iron; -- called also {chromic iron}.
      [1913 Webster]

   2. (Chem.) A compound or salt of chromous hydroxide regarded
      as an acid. [R.]
      [1913 Webster]