Euxenite or euxenite-Y is a brownish black mineral with a metallic luster, found in Norway. It contains calcium, niobium, tantalum, cerium, titanium, yttrium, and sometimes uranium, with some other metals. The chemical formula is: (Y,Ca,Ce)(Nb,Ta,Ti)2O6. It occurs in pegmatites and black sands. Typically amorphous due to radiation damage.
A small group of pegmatites in Chaffee and Fremont Counties, Colorado, is characterized by the association of fluorite with the rare earth minerals euxenite monazite allanite, and gadolinite.
Both monazite and euxenite replace and vein the white plagioclase (calcic albite to sodic oligoclase) and are themselves veined and corroded by white fluorite, red albite, and an unidentified soft yellow-gray mineral.
The monazite, which appears to be slightly older than the euxenite, is associated with a few small blebs of gadolinite and is cut by minute veinlets of apatite as well as specular hematite.
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