Goethite

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A grouping of lustrous somewhat iridescent stalactitic goethite. Neat old time example for this area.Fredericktown, located in Madison County, Missouri, is a historic mining district situated within the Southeast Missouri Lead District, with commercial mining and smelting operations dating back to the early 19th century. Geologically, the area is characterized by Paleozoic sedimentary rocks, primarily Bonneterre Dolomite and Lamotte Sandstone, lying unconformably over Precambrian granitic and rhyolitic basement highs, which served as a structural trap for complex hydrothermal ore solutions. Mineralogically, the district is widely recognized for producing exceptional specimen-grade minerals, most notably botryoidal and iridescent goethite, alongside lead, copper, cobalt, and nickel sulfides associated with ancient Precambrian weathering profiles and secondary oxidation zones.