LithoMap

Mineral identification comparison

Galena vs. sphalerite: how to tell them apart

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.

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Silvery-gray galena specimen showing prominent cubic crystal faces
GalenaLead sulfide · PbSPhoto: U.S. Geological Survey · Public domain
Dark resinous sphalerite specimen from Creede, Colorado
SphaleriteZinc sulfide · ZnSPhoto: U.S. Geological Survey · Public domain
Quick answer

The most useful distinction

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

Galena and Sphalerite comparison table

PropertyGalenaSphaleriteHow to use it
CleavageThree perfect directions at 90°, producing cubesSix perfect directions, producing many-faced fragmentsCleavage geometry is the strongest visible distinction.
StreakLead-gray to blackWhite, pale yellow, or light brownPowder color remains different even when both specimens look dark.
Luster and colorMetallic lead-grayResinous to adamantine; yellow, brown, red-brown, or blackIron-rich sphalerite may look nearly metallic, so pair luster with cleavage.
Density and hardnessHeavier and softer, Mohs about 2.5Lighter and harder, Mohs 3.5 to 4Heft and scratch resistance support the primary clues.
Field sequence

A practical identification sequence

  1. 1

    Inspect existing broken surfaces for cubes or numerous angled cleavage faces.

  2. 2

    Compare luster under diffuse light rather than direct glare.

  3. 3

    Use a minimal streak test only on expendable material.

  4. 4

    Check for intergrowths because both minerals commonly occupy the same specimen.

Limits and cautions

Where the distinction gets difficult

  • 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.

Use several independent observations. This comparison supports preliminary field identification, not laboratory confirmation, appraisal, proof of origin, or collecting permission.

Common questions

Galena vs. sphalerite FAQ

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.

Source basis

Authoritative sources

LithoMap wrote this comparison in original language from the physical properties and geological concepts supported by these public scientific references.

Editorial review: September 17, 2026.

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