Hausmannite (Botryoidal)- Långban, Filipstad Municipality, Värmland County, Sweden

Hausmannite (Botryoidal)
Långban, Filipstad Municipality, Värmland County, Sweden
Dimensions: 5.6 × 4.0 × 1.1 cm
Provenance: Original vintage collection label, catalog no. 134, included with specimen.

An attractive botryoidal Hausmannite specimen from the historic Långban mining district of Sweden. This flattened, irregularly shaped specimen displays a dark charcoal-gray to nearly black coloration, with a dense covering of rounded, grape-like mineral growths. Numerous individual nodules and interconnected clusters create a richly textured surface, ranging from tiny spherical formations to larger, more prominent rounded aggregates. Its predominantly matte to subdued metallic appearance emphasizes the intricate botryoidal structure, while scattered lighter areas provide subtle contrast.

Hausmannite is a manganese oxide mineral with the chemical formula Mn₃O₄, recognized for its dark coloration and occurrence in manganese-rich geological environments. Långban is one of Sweden's most celebrated mineral localities, internationally recognized for its extraordinary mineral diversity and complex manganese- and iron-rich deposits. The district has produced numerous unusual mineral species and remains an important locality in the history of mineralogical research. This vintage-labeled specimen represents the distinctive manganese oxide mineralization associated with this classic Swedish locality.