[en] To detect interrelations between boltwoodite and weeksite from the regions of their joint segregation an attempt has been made to study the above uranium silicates by means of scanning electron microscopy. Investigations have been carried out with the Phillips 501-B device comprising the adax 91-00 microanalysing adapter. Large plate and columnar crystals and their growths of boltwoodite, where bunched weeksite concentrations precipitate, are distictly traced. A lot of bolt woodite crystals represent only a coating filled with weeksite formed due to its destruction. Data on boltwoodite and weeksite composition are obtained. Coincidence of mineral microsegregation visualization with their analysis turns out well for the ferst time