Goethite Michigan, USA Dimensions: 6.0 × 4.8 × 2.7 cm Provenance: Original vintage collection label, catalog no. 141, included with specimen. The original label identifies the mineral as Limonite.
An impressive Goethite specimen featuring deep black to dark steel-gray coloration with exceptionally lustrous surfaces and prominent fibrous crystal growth. Broad, reflective areas display a brilliant, nearly metallic sheen, while tightly packed, vertically striated formations create intricate textures across the specimen. Distinctive stepped growth patterns and curved, layered structures provide additional visual interest. Rich golden-brown and rusty orange iron oxide coloration accents the lower portions, contrasting beautifully with the glossy black surfaces.
Goethite is an iron oxyhydroxide mineral with the chemical formula FeO(OH), commonly forming through the oxidation and alteration of iron-bearing minerals. It occurs in a variety of habits, including radiating fibrous aggregates, botryoidal masses, and compact crystalline formations. Michigan's historic iron-mining regions, particularly those of the Upper Peninsula, are well known for their extensive iron deposits and associated secondary iron minerals. This specimen displays the characteristic fibrous structure and lustrous surfaces that make crystalline Goethite especially appealing to collectors.
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