mineral

Galena (likely)

Galena, lead sulfide (PbS)

AI-generated identification · may be incorrect

Metallic gray to silver, commonly coarse-grained with bright reflective surfaces; Mohs hardness 2.5–2.75, cubic crystal system, perfect cubic cleavage, and very high specific gravity (~7.5). The specimen may include iridescent tarnish or minor associated sulfides.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-replacement deposits when lead- and sulfur-rich fluids cool, commonly with sphalerite, pyrite, and quartz. Deposits range from Precambrian to Cenozoic ages.

Uses & applications

The principal ore of lead and an important historical source of silver; specimens are collected for their metallic luster and cubic cleavage. Handle carefully because lead-bearing dust and residues are toxic.

Geological facts

Fresh galena is usually lead-gray, but weathering can produce colorful iridescent surfaces. Its heft is a useful clue: it feels unusually heavy for its size.

Field identification & locations

Identify it by its exceptional density, metallic gray color, cubic cleavage, and dark gray streak; avoid inhaling dust or licking the specimen. Common localities include Missouri and Colorado (USA), Peru, Australia, and the UK.