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From 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]