Jordanite
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Mineral NameJordanite
Chemical FormulaPb14(As,Sb)6S23
Mohs Hardness3
Crystal Systemmonoclinic
Lustermetallic
Streak Colorblack
Cleavagedistinct on {001}
Fractureuneven
Specific Gravity6.39
Colorslead-gray, steel-gray, dark gray
Transparencyopaque
Type LocalityLengenbach quarry, Binntal, Valais, Switzerland
Mineral GroupSulfosalts
Usescollector
Associated Mineralsdolomite, quartz
Rarityrare
Description
A dark lead-gray, metallic, well-formed crystal of Jordanite, exhibiting distinct faces and a prismatic habit, embedded within a white dolomite matrix and accompanied by smaller, clear to yellowish quartz crystals.
Geological Context
Jordanite is a rare sulfosalt mineral typically found in low-temperature hydrothermal veins, often in dolomite or marble, associated with other lead and arsenic minerals. The Lengenbach quarry is renowned for its unique assemblage of sulfosalts formed under specific metamorphic and hydrothermal conditions.
