Sillimanite in Kenya is distributed in pelitic gneisses over a large metamorphic area and does not show a relative concentration in granitic centers. In nonmigmatized areas the sillimanite is inconspicuous; in migmatized areas it commonly occurs with quartz in knots or faserkiesel. The sillimanite zone is 100 miles wide, and the kyanite zone is even wider, but more detailed information may define regions in which biotite, garnet, and staurolite are characteristic. High-grade metamorphic conditions are indicated, which were accompanied by granitization processes.

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