# How to identify sphalerite

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

## Summary

Sphalerite is the principal zinc sulfide, recognized by resinous to adamantine luster, pale yellow to dark brown or black color, perfect cleavage in six directions, and a light-colored streak that may smell sulfurous when freshly scratched.

## Quick identification clues

- Resinous, greasy, or adamantine luster
- Mohs hardness about 3.5 to 4
- Six directions of perfect cleavage
- White to pale brown or yellowish streak

## Composition and classification

Sphalerite is zinc sulfide, ZnS, with iron commonly substituting for zinc and darkening the mineral. Cadmium, manganese, mercury, gallium, germanium, and other elements may occur in trace amounts; composition cannot be inferred safely from color.

## Appearance

Sphalerite ranges from honey-yellow and red-brown to nearly black. Transparent pale crystals may be highly brilliant, while iron-rich material can look dark and submetallic.

Crystals are commonly tetrahedral or complex, but massive granular material is widespread. Numerous bright cleavage faces can create a flashing resinous appearance.

## Identification tests

- Hardness: 3.5 to 4. Scratched by steel and harder than galena.
- Streak: White to pale yellow or light brown. Usually much lighter than the gray-black streak of galena.
- Cleavage: Perfect in six directions. Produces many repeated reflective faces rather than cubic blocks.
- Luster: Resinous to adamantine; sometimes submetallic. The resin-like shine is a useful clue, especially in brown material.

## Common lookalikes

- Galena: Denser, metallic lead-gray, much darker-streaked, and cubically cleaved.
- Garnet: Harder, lacks cleavage, and commonly forms equant many-faced crystals.
- Chalcopyrite: Brass-yellow, metallic, greenish-black-streaked, and lacks sphalerite’s six perfect cleavages.

## Direct side-by-side comparisons

- Galena vs. sphalerite — https://lithomap.app/resources/mineral-identification/compare/galena-vs-sphalerite
- Cassiterite vs. sphalerite — https://lithomap.app/resources/mineral-identification/compare/cassiterite-vs-sphalerite

## Most relevant related guides

- Galena — https://lithomap.app/resources/mineral-identification/galena
- Cassiterite — https://lithomap.app/resources/mineral-identification/cassiterite
- Chalcopyrite — https://lithomap.app/resources/mineral-identification/chalcopyrite
- Garnet — https://lithomap.app/resources/mineral-identification/garnet

## Formation

Sphalerite forms in hydrothermal veins, carbonate-hosted lead-zinc deposits, volcanogenic massive sulfides, skarns, and sedimentary exhalative deposits.

It commonly occurs with galena, pyrite, chalcopyrite, calcite, dolomite, fluorite, barite, and quartz. These intergrowths can complicate simple field tests.

## Occurrence and geologic setting

Sphalerite is widespread in zinc and lead-zinc districts. Dark iron-rich varieties and pale gemmy varieties can look so different that testing is essential.

An identification does not determine zinc grade or byproduct-metal content. Consequential decisions require sampling and laboratory analysis.

## Uses and significance

Sphalerite is the primary ore mineral for zinc, which is used for galvanizing steel, brass and other alloys, batteries, die casting, and chemical products.

## Field safety and limitations

- Avoid creating or inhaling sulfide dust and wash hands after handling.
- Do not rely on a sulfur odor test; scratching or striking unknown material can create unnecessary dust.
- Old lead-zinc mine sites may contain lead, cadmium, arsenic, and unstable workings.

## Authoritative sources

- Zinc Statistics and Information — U.S. Geological Survey: https://www.usgs.gov/centers/national-minerals-information-center/zinc-statistics-and-information
- 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/sphalerite.webp
- Description: Dark resinous sphalerite specimen from Creede, Colorado
- 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/sphalerite

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.