If it’s blocky, silvery, and heavy, it’s galena.

Physical Properties
Chemical Formula PbS
Class Sulfide
Crystal system Cubic
Habit Cubic
Cubes modified by octahedra
Color Lead gray
Hardness 2.5
Specific gravity 7.6
Cleavage/fracture Perfect {100}
Fracture Subconchoidal
Luster Metallic
Transparency Opaque
Streak Lead gray
Twinning Penetration
after Perkins, 357

Galena in Hand Sample

Four small samples of galena

Further Reading

Galena at
Galena at