mineral
Sphalerite with quartz
Sphalerite (ZnS), associated with quartz (SiO₂)
AI-generated identification · may be incorrectDark 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.
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Physical properties
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.
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.
