Jordanite is a sulfosalt mineral with chemical formula in the monoclinic crystal system,Mindat information page for Jordanite named after the German scientist (1808–1887) who discovered it in 1864.
Lead-grey in colour (frequently displaying an iridescent tarnish), its streak is black and its lustre is metallic. Jordanite has a hardness of 3 on Mohs scale, has a density of approximately 6.4, and a conchoidal fracture.
The type locality is the Lengenbach Quarry in the Binn Valley, Wallis, Switzerland.
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