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The Precambrian chromites of the Eastern Desert (Egypt) chromite mineral chemistry
Conference proceeding

The Precambrian chromites of the Eastern Desert (Egypt) chromite mineral chemistry

A. K. M. Attia, S. N. Boulis, A. H. Ahmed, M. E. Hilmy, G. Garuti and F. Zaccarini
Proceedings of the ... International Congress on Applied Mineralogy, Vol.6, pp.259-262
Sixth international congress on Applied mineralogy in research, economy, technology, ecology, and culture
2000

Abstract

Africa alteration chromite ores chromitite crystal chemistry distribution Eastern Desert Egypt electron probe data geochemistry Geochemistry of rocks, soils, and sediments igneous rocks metal ores metamorphic rocks mineral composition North Africa ophiolite plutonic rocks Precambrian ultramafics
The composition of 32 chromites from altered and metamorphosed Precambrian ophiolites has been determined by EPMA. The chromites generally display magnetite rims and cores of chromite: they have TiO (sub 2) < 0.30 wt.% and Fe (sub 2) O (sub 3) < 6.0 wt.%. Two main groups are identified: Cr-rich (Cr (sub 2) O (sub 3) 55-63 wt.%) and Al-rich (Al (sub 2) O (sub 3) 19-27 wt.%).

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