Hisingerite
Santa Creu d'Olorda, Barcelona, Catalonia, Spain
Dimensions: 6.1 × 4.5 × 2.9 cm
Provenance: Original collection label, catalog no. 529, identifying the specimen as Hisingerite from Santa Creu d'Olorda, Barcelona, Spain.
An unusual specimen displaying richly colored, golden-yellow to amber-brown mineralization with a glossy, resinous appearance. The material forms thick, irregular masses with angular projections, translucent edges, and intricate internal fractures. Contrasting areas of dark brown and earthy gray matrix accentuate the vivid honey-colored surfaces, creating a striking interplay of color, texture, and luster.
Hisingerite is a hydrous iron silicate mineral commonly associated with the alteration of iron-bearing silicates. Its appearance ranges from dark brown and black to yellowish-brown, with massive, earthy, and occasionally resinous forms reflecting variations in composition and hydration.
Santa Creu d'Olorda, in the hills surrounding Barcelona, is a historic mineral locality known for its diverse iron-bearing mineral assemblages. Specimens from this locality preserve an interesting record of mineral alteration and the geological history of Catalonia.
