Goethite Bilbao, Biscay, Basque Country, Spain Dimensions: 6.5 × 5.0 × 3.0 cm Provenance: Original vintage collection label, catalog no. 139, included with specimen.
An impressive Goethite specimen featuring glossy, jet-black botryoidal formations across a contrasting earthy brown and dark gray matrix. Rounded, overlapping mineral growths create a striking sculptural appearance, with surfaces ranging from smooth, highly reflective domes to finely textured, almost metallic-looking areas. Several exposed sections display radiating, fibrous structures, while smaller botryoidal clusters are scattered throughout the matrix.
Goethite is an iron oxyhydroxide mineral, FeO(OH), commonly formed through the weathering and oxidation of iron-bearing minerals. It frequently develops botryoidal, stalactitic, and radiating fibrous habits, producing distinctive rounded formations and silky to submetallic surfaces. The Bilbao region of northern Spain has a long history of iron mining and is well known for its iron-rich geological formations. This vintage-labeled specimen offers an appealing example of classic Spanish iron mineralogy, combining dramatic botryoidal growth with historical collection provenance.
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