# How to identify galena

Canonical page: https://lithomap.app/resources/mineral-identification/galena
Last reviewed: September 17, 2026
Page purpose: Original LithoMap mineral identification reference for field observations, search systems, and language models.
Classification: Lead sulfide · PbS

## Summary

Galena is a dense, metallic lead-gray sulfide recognized by perfect cubic cleavage, a gray to black streak, and unusual heft; it is also a lead-bearing mineral that requires careful handling.

## Quick identification clues

- Metallic lead-gray color and luster
- Perfect cleavage in three directions at 90°
- Very dense for a nonmetallic-looking hand specimen
- Gray to black streak and Mohs hardness about 2.5

## Composition and classification

Galena is lead sulfide, PbS. It may contain silver and other trace elements, but visible galena does not reveal silver content or ore grade. Weathering can produce anglesite, cerussite, and lead-bearing surface coatings.

## Appearance

Galena commonly forms cubes, blocky cleavage fragments, granular masses, and coarse metallic veins. Fresh surfaces are bright lead-gray; weathered surfaces become dull gray or dark.

Three perfect cleavage directions meet at right angles, repeatedly producing cubes and rectangular steps. That geometry is more diagnostic than brightness.

## Identification tests

- Hardness: About 2.5. Soft enough to scratch with copper or steel.
- Streak: Lead-gray to black. Supports galena but should be performed without generating unnecessary powder.
- Cleavage: Perfect cubic cleavage. Three directions at 90° are the strongest visual clue.
- Density: Very high; specific gravity about 7.5. A compact piece feels conspicuously heavy.

## Common lookalikes

- Silver: Malleable and silver-white on a fresh surface, without galena’s cubic cleavage.
- Magnetite: Harder, black-streaked, strongly magnetic, and lacks cubic cleavage.
- Graphite: Much lighter, greasy-feeling, and leaves a dark mark readily.

## Direct side-by-side comparisons

- Silver vs. galena — https://lithomap.app/resources/mineral-identification/compare/silver-vs-galena
- Galena vs. sphalerite — https://lithomap.app/resources/mineral-identification/compare/galena-vs-sphalerite
- Pyrite vs. galena — https://lithomap.app/resources/mineral-identification/compare/pyrite-vs-galena
- Graphite vs. galena — https://lithomap.app/resources/mineral-identification/compare/graphite-vs-galena

## Most relevant related guides

- Graphite — https://lithomap.app/resources/mineral-identification/graphite
- Silver — https://lithomap.app/resources/mineral-identification/silver
- Sphalerite — https://lithomap.app/resources/mineral-identification/sphalerite
- Pyrite — https://lithomap.app/resources/mineral-identification/pyrite

## Formation

Galena forms in hydrothermal veins, replacement deposits, carbonate-hosted Mississippi Valley–type deposits, volcanogenic massive sulfides, skarns, and some metamorphic settings.

Common associates include sphalerite, pyrite, chalcopyrite, fluorite, barite, calcite, and quartz. Mixed ore can combine their streaks and hardness responses.

## Occurrence and geologic setting

Galena is widespread in lead-zinc districts and many polymetallic veins. Its presence may indicate an ore-forming system but does not establish a commercial deposit.

Mine waste and old smelter areas may contain dispersed lead contamination even where attractive crystals are absent.

## Uses and significance

Galena has historically been the principal mineral source of lead, used in lead-acid batteries, radiation shielding, specialized alloys, and other controlled industrial applications.

## Field safety and limitations

- Do not lick, taste, grind, saw, or polish galena.
- Wash hands after handling and keep specimens away from children and food areas.
- Avoid dust at mines, dumps, and old processing sites where lead contamination may be widespread.

## Authoritative sources

- Lead—Soft and Easy to Cast — U.S. Geological Survey: https://pubs.usgs.gov/publication/fs20113045
- Minerals and their physical properties — U.S. National Park Service: https://www.nps.gov/subjects/geology/minerals.htm
- Mohs Hardness Scale — U.S. National Park Service: https://www.nps.gov/articles/mohs-hardness-scale.htm
- Natural Gemstones: Mineral Gemstones — U.S. Geological Survey: https://pubs.usgs.gov/gip/gemstones/mineral.html

## Specimen photograph

- Image: https://lithomap.app/_delivery/identification/minerals/galena.webp
- Description: Silvery-gray galena specimen showing prominent cubic crystal faces
- Creator: U.S. Geological Survey
- License: Public domain — https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits
- Source record: https://www.usgs.gov/media/images/galena-specimen-2

This reference supports preliminary field identification. It is not a laboratory determination, appraisal, hazard assessment, proof of origin, or statement of land ownership, legal access, or collecting permission.