Abstract
The mineral composition of hydrogenic uranium ore of the Dalmatovo deposit was studied with analytical scanning electron microscopy. The results correspond to earlier known data only in general terms. Phosphosilicate uranium mineralization, which is predominant in the samples, is similar to P-bearing coffinite in elemental composition but differs in morphology. The quantitative analysis of microcrystals corresponds to the formula (U,Ca)[(Si,P)O4]2, where U/Si ratio is twice as low as in coffinite. The occurrence of oxide pitchblende mineralization has been confirmed. The initial stage of the formation of uranyl minerals has been revealed. The mineral species of Ti-U substance that determines geochemical attributes of the Dalmatovo deposit is considered.
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