The chromite deposits and the associated silicate rocks of Barramia and Umm Salatit were crystallized from an olivine-enstatite magma. The main deposits are lenticular and were formed at an early stage in deep horizons, then carried up as solid inclusions by the ultramafic silicate magma during its emplacement. "The ore segregated from peridotite poor in feldspar and low in iron and aluminum. The chromite was corroded by the silicate fluids, and also altered by the late magmatic fluids that serpentinized and steatitized the ultramafic country rock. The deposits also include some late magmatic disseminated ore and hydrothermal chromite veinlets."

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