Abstract

Starkeyite1 was described as a new mineral by the writer in 1945. It was found as a dull, white, powdery efflorescence on an altered mixture of pyrite and marcasite at the Starkey Mine in Madison County, Missouri. The country rock is a gray, granular glauconitic dolomite containing vugs lined with dolomite crystals. The dolomite rests upon a white friable sandstone and laps against a Precambrian felsite porphyry.

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