Authigenic tourmaline has been observed as a secondary growth on small detrital grains of tourmaline in Lower Devonian rocks from oil-wells in the Lower Peninsula of Michigan.1 More recently it has been noted in the Lower Monroe dolomite from the quarry of Messrs. France Stone Co., in Monroe County, Michigan. Similar grains of tourmaline with an authigenic portion have been described from the Oriskany Sandstone of several of the eastern states of America.2

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