Freieslebenite
Image: Freddo213 (CC BY-SA 4.0)
Mineral NameFreieslebenite
Chemical FormulaPbAgSbS₃
Mohs Hardness2
Crystal Systemmonoclinic
Lustermetallic
Streak Colordark grey to black
Cleavagegood on {110}
Fractureuneven to subconchoidal
Specific Gravity6.2
Colorssteel-grey, dark grey
Transparencyopaque
Type LocalityVerdad de los Artistas Mine (Los Artistas mine), Hiendelaencina, Guadalajara, Castile-La Mancha, Spain
Mineral GroupSulfosalts
Usescollector's mineral, minor ore of silver, minor ore of lead
Associated Mineralsgalena, quartz
Rarityuncommon
Description
The image displays lustrous, dark steel-grey, prismatic to tabular crystals of Freieslebenite, exhibiting distinct striations, intergrown with blocky galena crystals and a lighter, possibly quartz matrix.
Geological Context
Freieslebenite is a sulfosalt mineral typically found in low- to medium-temperature hydrothermal veins, often associated with other lead, silver, and antimony sulfides.
