The contrasting dark gray to black, high lustered mineral sitting on a backdrop of massive white dolomitic marble makes for a very nice mineral display specimen. Jordanite is a rare sulfide mineral found mostly at the famous quarry of Lengenbach , Binnental, Valais, Switzerland. Most of the more exotic minerals from this site are arsenic sulfosalts, like jordanite, and other sulfides. Jordanite is a mineral formed from hydrothermal solutions that intermixed with the local country rock's chemistry to produce some exotic mineral species. In this case jordanite is the arsenic rich mineral and geocronite is the antimony rich mineral.
Color is a lead gray to black.
Luster is metallic. Crystals are opaque. Cleavage is poor in one direction. Hardness is 3. Streak is dark brown.