Metamorphosed manganiferous formations in Brazil, U.S.A., Ghana, French West Africa, Southwest Africa, Madagascar, Sweden, U.S.S.R., and Japan are each compared with the type gondites (metamorphosed non-calcareous manganiferous sediments containing manganese silicates and high-temperature lower oxides of manganese) and kodurites (manganiferous skarn) described by Fermor from India.

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