mineral

Metallic sulfide-bearing rock, likely galena-rich ore

Galena (lead sulfide, PbS), possibly mixed with pyrite and host rock

AI-generated identification · may be incorrect

Small irregular gray specimen with metallic luster and granular/crystalline texture. Galena has Mohs hardness 2.5–2.75, very high specific gravity (~7.5), cubic crystals and perfect cubic cleavage; pyrite inclusions may be brassy and harder (6–6.5).

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely hydrothermal vein ore formed when hot, mineral-rich fluids deposited sulfides in fractures, commonly during the Paleozoic or younger. The image is insufficient to establish an exact species or age.

Uses & applications

Galena is the principal lead ore and historically supplied silver; specimens are collected but should not be used in jewelry or handled by children because lead dust is toxic.

Geological facts

Fresh galena is lead-gray and exceptionally heavy for its size; broken surfaces tarnish to dull gray. Pyrite can resemble gold but is much harder and commonly forms cubes.

Field identification & locations

Test cautiously by heft, streak, and cleavage: galena gives a dark gray streak and breaks into cubes, whereas pyrite gives a greenish-black streak and resists scratching. Common in Missouri, Idaho, Colorado, Peru, Australia, and Mexico.