What is Jordanite?
Jordanite is a dense lead-arsenic sulfosalt with a metallic grey appearance, an important member of complex hydrothermal ore assemblages.
Mineralogy and crystal structure
Reference formula: Pb28As12S46. Jordanite has a monoclinic layered sulfosalt structure and forms a series with geocronite. Natural material may contain antimony substitutions, so the ideal formula is a reference rather than a complete description of every specimen. Jordanite is classified with sulfosalts and has a monoclinic crystal system. Typical hardness is 2.5–3 on the Mohs scale and specific gravity is approximately 6.2–6.4.
Colour, lustre and habit
Typical colours include lead-grey, black, grey. The usual tabular, granular, massive habit and metallic lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Jordanite forms in or is associated with low-temperature hydrothermal veins rich in lead, arsenic, antimony and sulfur. Important documented localities include Germany, Austria, Italy, Switzerland, the United States and Mexico.
A high-density specimen for the ore-mineral specialist
Jordanite is compelling when a collection moves beyond colour into structure and paragenesis. Its subdued metallic surface, high density and complex lead-arsenic chemistry reward a display that includes the associated sulfides and sulfosalts of the vein.
Metallic minerals and historical craft
Metallic lustre has long shaped the visual language of ore collecting and historic mining. Any symbolic interpretation of Jordanite should remain cultural; its scientific importance is its sulfosalt structure and ore-forming environment.
Collecting and care
Lead- and arsenic-bearing: keep sealed or protected, avoid dust and hand-to-mouth contact, and do not cut or grind at home.
