Abstract
The sequence of formation of pyrochlore crystals of various morphology and composition is considered in an aggregate with ilmenite and feldspar of nepheline-feldspar pegmatite at Mt. Dolgaya (Vish-nevye Mountains, South Urals): altered yellowish green «uranium pyrochlore» with a UO3 content of 7.62– 42.44 wt. % in different parts of the crystal, and also fuorocalciopyrochlore, fersmite, and associated minerals. The alteration of «uranpyrochlore» includes fersmitization and silicifcation in contrast to relatively late fuo-rocalciopyrochlore and fersmite. The compositions and Raman spectra of altered «uranpyrochlore» and later fuorocalciopyrochlore are given.
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