Ultrabasic rocks and basic charnockites in biotite-garnet-sillimanite gneisses and graphite-garnet-wollastonite marbles located in the Northeast Ahaggar Mts
Complex ultrabasic lens : orthoferrosilite-clinopyroxenite, orthopyroxenite and norite(hypersthene, clinopyroxene, magnetite and labradorite), cut by an hypersthene charnockitic pegmatite.
Description of the orthoferrosilite-clinopyroxenite mineralogy.