The Collaborative International Dictionary of English v.0.48:

Cacoxene \Ca*cox"ene\, Cacoxenite \Ca*cox"e*nite\, n. [Gr.
   kako`s bad + ????? guest.] (Min.)
   A hydrous phosphate of iron occurring in yellow radiated
   tufts. The phosphorus seriously injures it as an iron ore.
   [1913 Webster]