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Samarskite-Y, with an average assay of about 43.23% Nb2O5 and 17.43% Y2O5has been identifid in the mineralized\udpegmatite bodies injected in Gabal Umm Lassifa monzogranite. The mineral is associated with columbite, zircon,\udmonazite, cassiterite, ilmenite and rutile. The mineralogy and geochemistry of the studied samarskite variety were\uddetermined using microscopic examination and X-ray Diffraction (XRD) as well as quantitative analysis by both\udField emission scanning electron microscope and electron microprobe analysis. Microscopic investigation revealed\udthat the defied samarskite crystals are characteristically velvet-yellow brown to bloody red in color and having a\udcharacteristic pendent vitreous or resinous luster.\udAnalytical data confimed the presence of samarskite-Y whose composition corresponding to empirical formula:\ud[(Y0.42, REE0.44, Th0.076, Si0.05, Ca0.007, U0.07, Fe0.077) ∑1.15 (Nb0.81, Ta0.04, Ti0.14) ∑0.86 O4]. Accordingly, the mineralized Umm\udLassifa pegmatite can be considered as a promising target ore for its rare-metal mineralization that includes mainly\udNb, Ta, Y, REE and Zr together with U and Th

Occurrence of Samarskite-Y in the Mineralized Umm Lassifa Pegmatite, Central Eastern Desert, Egypt