What is Quenselite?
Quenselite is a rare lead manganese oxide hydroxide, usually dark and fine-grained, prized for its unusual chemistry and association with oxidised manganese deposits.
Mineralogy and crystal structure
Reference formula: PbMnO2(OH). Quenselite is monoclinic in the selected COD model. Lead-bearing minerals should be handled as collection specimens rather than lapidary or household materials, and dark massive material needs locality evidence for confident identification. Quenselite is classified with oxides and has a monoclinic crystal system. Typical hardness is 3–4 on the Mohs scale and specific gravity is approximately 5.2–5.6.
Colour, lustre and habit
Typical colours include black, dark grey, brown. The usual tabular, massive, crusty habit and sub-metallic, dull lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Quenselite forms in or is associated with oxidised manganese and lead-bearing deposits, where secondary fluids transform earlier ore minerals. Important documented localities include authenticated oxidised lead-manganese localities and historical European mineral occurrences.
A dark record of lead-manganese oxidation
Quenselite appeals to collectors who value rare chemistry and paragenesis. Its restrained appearance rewards a good label, a documented locality and a close look at the oxidation history of the deposit.
Collecting and care
Keep enclosed and dry, avoid acids and dust, and wash hands after handling. Do not grind, tumble or use in jewellery.
