mineral

Likely galena (lead sulfide)

Galena, PbS

AI-generated identification · may be incorrect

Dark gray to lead-gray with metallic luster and prominent blocky cleavage; hardness 2.5–2.75 Mohs, cubic crystal structure, and very high specific gravity (~7.4–7.6). The photo is consistent with galena, though identification from an image alone is not definitive.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and sediment-hosted ore deposits, often alongside sphalerite, calcite, or quartz. Such deposits formed across many geological periods; age depends on locality.

Uses & applications

The principal ore of lead, historically used in batteries, cable sheathing, and shielding; attractive crystals are collected, but lead-bearing specimens require careful handling.

Geological facts

Galena’s unusually high density and cubic cleavage are distinctive; it commonly contains silver in small amounts. Avoid creating dust and wash hands after handling.

Field identification & locations

Look for a heavy, metallic-gray specimen that breaks into shiny cubic or stepped faces; a streak test gives a lead-gray streak. Common in mining districts worldwide, including the United States, England, and Australia.