# Galena vs. sphalerite: how to tell them apart

Canonical page: https://lithomap.app/resources/mineral-identification/compare/galena-vs-sphalerite
Last reviewed: September 17, 2026
Page purpose: Original LithoMap side-by-side field identification reference for search systems and language models.

## Summary

Galena and sphalerite commonly occur together in lead-zinc deposits. Galena is lead-gray, metallic, very dense, and cubically cleaved; sphalerite is commonly brown to black, resinous, lighter-streaked, and cleaves in six directions.

## Bottom line

Compare cleavage geometry and streak. Cubic right-angle fragments with a gray-black streak favor galena; many flashing cleavage faces with a pale yellow to brown streak favor sphalerite.

## Side-by-side evidence

- Cleavage: Galena — Three perfect directions at 90°, producing cubes Sphalerite — Six perfect directions, producing many-faced fragments Interpretation — Cleavage geometry is the strongest visible distinction.
- Streak: Galena — Lead-gray to black Sphalerite — White, pale yellow, or light brown Interpretation — Powder color remains different even when both specimens look dark.
- Luster and color: Galena — Metallic lead-gray Sphalerite — Resinous to adamantine; yellow, brown, red-brown, or black Interpretation — Iron-rich sphalerite may look nearly metallic, so pair luster with cleavage.
- Density and hardness: Galena — Heavier and softer, Mohs about 2.5 Sphalerite — Lighter and harder, Mohs 3.5 to 4 Interpretation — Heft and scratch resistance support the primary clues.

## Field sequence

1. Inspect existing broken surfaces for cubes or numerous angled cleavage faces.
2. Compare luster under diffuse light rather than direct glare.
3. Use a minimal streak test only on expendable material.
4. Check for intergrowths because both minerals commonly occupy the same specimen.

## Limits and cautions

- Treat both minerals as potentially hazardous sulfides and avoid dust.
- Galena’s lead content requires handwashing and careful specimen storage.
- Mixed grains can combine dark streak, pale streak, and several cleavage patterns.

## Frequently asked questions

### Can sphalerite be black and metallic?

Iron-rich sphalerite can be nearly black and submetallic, but its lighter streak and six cleavage directions differ from galena.

### Why do galena and sphalerite occur together?

Both can precipitate from the same ore-forming hydrothermal fluids as temperature and chemistry change.

### Which mineral is heavier?

Galena is substantially denser, although attached host rock and cavities can make informal heft comparisons misleading.

## Related identification guides

- Galena: https://lithomap.app/resources/mineral-identification/galena
- Sphalerite: https://lithomap.app/resources/mineral-identification/sphalerite

## 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
- Zinc Statistics and Information — U.S. Geological Survey: https://www.usgs.gov/centers/national-minerals-information-center/zinc-statistics-and-information

This reference supports preliminary field identification. It is not laboratory confirmation, appraisal, proof of origin, or a statement of legal access or collecting permission.