Galena
Galena, also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of silver.
Galena is one of the most abundant and widely distributed sulfide minerals. It crystallizes... Wikipedia
Crystal system: Cubic
Chemical formula: PbS
Cleavage: Cubic perfect on, parting on
Crystal habit: Cubes and octahedra, blocky, tabular and sometimes skeletal crystals
Fracture: Subconchoidal
Luster: Metallic on cleavage planes
Mohs scale hardness: 2.5–2.75
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