Goethite

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Lustrous botryoidal crystalline goethite specimen without matrix. Nice for the species and locality.The geology around Ishpeming, Michigan, features ancient Precambrian formations of the Marquette Iron Range, characterized by folded and banded iron-bearing sedimentary rocks like the Negaunee Iron Formation. Mining history here began in the mid-19th century, transforming the region into a major underground and open-pit producer of iron for American industry. Mineral collectors and miners frequently encountered goethite, an iron oxyhydroxide mineral that formed extensively as a secondary weathering product and comprised a major component of the soft, earthy iron ores filling local cavities and fractures.