Little has been added to our knowledge of the geochemistry of Re since the work of Noddack and Noddack in 1931, except that many determinations have been published of the Re content of molybdenite, the only present source. These determinations, 150 in all, have been assembled. The Re content of molybdenite ranges from none to 3,250 p.p.m. Re, and varies widely, even in samples from a single deposit. No generalizations are yet possible as to correlations of Re content with geological conditions of formation. Other possible sources of Re are considered briefly.

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