mineral

Sphalerite with quartz

Sphalerite (ZnS), associated with quartz (SiO₂)

AI-generated identification · may be incorrect

Dark brown to nearly black, resinous-to-submetallic sphalerite with pale translucent quartz; sphalerite hardness 3.5–4 and perfect dodecahedral cleavage, quartz hardness 7. The specimen’s visible crystal faces and scale are insufficient for confident identification from the image alone.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in hydrothermal veins and carbonate-hosted ore deposits as zinc-rich fluids cool; associated minerals may be much older or younger depending on the deposit.

Uses & applications

Sphalerite is the principal ore of zinc, used for galvanizing steel, brass, and other products; attractive specimens are collected, while quartz has broad industrial uses.

Geological facts

Sphalerite’s high dispersion can produce colorful flashes in transparent, gem-quality pieces, though this dark specimen is primarily of mineralogical or ore interest.

Field identification & locations

Look for dark, lustrous crystals with conspicuous cleavage and pale quartz; common worldwide in hydrothermal and replacement deposits. Confirm with a streak and cleavage tests, since several dark sulfides look similar.