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C. Maijer, P. A. M. Andriessen, E. H. Hebeda, J. B. H. Jansen and R.H. Verschure 1981. Osumilite, an approximately 970 Ma old high-temperature index mineral of the granulite-facies metamorphism in Rogaland, SW Norway. Netherlands Journal of Geosciences. (Jan. 1981), 267-272.