Mineralogy of Mineralized Pegmatite of Ras Mohamed Granite , Southern Sinai , Egypt (original) (raw)

An economically important rare-metal mineralization is recorded in the mineralized pegmatite injected in alkali-feldspar microgranite of Gabal Samma at North Ras Mohammed granitic pluton, Southern Sinai, Egypt. The studied mineralization was found as distinguishable megascopic crystals scattered within the pegmatitic bodies of Gabal Samma granite and reach up to tens of centimeters. The mineralogy and geochemistry of the studied rare metal mineralization were determined using microscopic examination and X-ray Diffraction (XRD) as well as scanning electron microscope (SEM). These minerals include a unique occurrence of colored ishikawaite (uraniumrich samarskite) together with fergusonite-Y, allanite, titanite, zircon-thorite association, uranothorite and fluorite. The obtained SEM data for the studied minerals are showing the compositional limits of these minerals as specified in the literature. The occurrence of colored ishikawaite varieties (light brown, reddish dark brown and dar...

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