Description

Hausmannite is a high-temperature decomposition product of lamellar manganese oxides, usually forming in high-temperature hydrothermal veins and manganiferous contact metamorphic zones. Associated with bixbyite, magnetite, hematite, pyrolusite and psilomelane.

Specimen of octahedral crystals of hausmannite, a mineral from the Oehrenstock deposit in Thuringia, Germany.

Mineral from the Deyrolle collection, a Parisian naturalist dealer. Comes with its handwritten label and original box (19th or early 20th century).

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