uran-ochre

from The Collaborative International Dictionary of English v.0.48

Uran-ocher \U"ran-o`cher\, Uran-ochre \U"ran-o`chre\, n. [Cf. F.
   uranochre.] (Min.)
   (a) A yellow, earthy incrustation, consisting essentially of
       the oxide of uranium, but more or less impure.
       [1913 Webster] Uranographic