mineral

Likely galena-bearing sulfide ore

Galena (lead sulfide, PbS), possibly with sphalerite and quartz/calcite gangue

AI-generated identification · may be incorrect

Dark gray to silver-gray, metallic luster, irregular massive texture, and apparent cubic cleavage/fracturing are consistent with galena; hardness about 2.5–2.75 Mohs and specific gravity about 7.4–7.6. The lighter crust may be quartz, calcite, or oxidation products, but the image alone cannot confirm the minerals.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and replacement deposits, commonly with sphalerite, pyrite, chalcopyrite, quartz, and carbonates. Most deposits formed during various Precambrian to Phanerozoic hydrothermal events; age requires locality data.

Uses & applications

Galena is the principal ore of lead and historically an important source of silver. Attractive crystalline specimens are collected, but it is generally unsuitable for jewelry because it is soft, brittle, and toxic.

Geological facts

Fresh galena commonly breaks along three directions at right angles, producing cubic fragments; tarnished surfaces can appear dull or bluish-gray. Lead-bearing material should not be handled extensively, inhaled as dust, or used around food.

Field identification & locations

Check for very high heft, metallic gray color, cubic cleavage, and a dark gray streak; a streak test and density measurement are useful, while acid testing is not diagnostic. Common localities include the U.S. Midwest, Missouri, Colorado, Mexico, Peru, Australia, and Europe.