Grunerite-bearing rocks of the central Gabon region, French Equatorial Africa, are amphibolites, in which cummingtonite and hudsonite accompany the grunerite, and pyroxenites characterized by the predominance of hypersthene. Anorthosites are generally associated with the amphibolites and pyroxenites. Chemical analyses indicate that all three groups constitute an entity rich in iron and poor in alkalis. The rocks are considered differentiation products of a basalt magma, which were later recrystallized.

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