mineral

Sphalerite in quartz gangue

Sphalerite (ZnS), associated with quartz (SiO₂)

AI-generated identification · may be incorrect

The dark, shiny mineral has a metallic-to-resinous luster and prominent cleavage; sphalerite is Mohs 3.5–4, with variable dark brown to black color and cubic crystal structure. The pale honey-colored material appears to be quartz, Mohs 7.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as sphalerite-bearing hydrothermal vein material, with quartz deposited from mineral-rich fluids in fractures. Such deposits formed at many geological ages; the specimen’s age cannot be determined from the image.

Uses & applications

Sphalerite is the principal ore of zinc, used for galvanizing steel, alloys, and chemicals. Attractive crystals and matrix specimens are collected.

Geological facts

Sphalerite’s zinc content can vary, and iron-rich varieties are often very dark. Its strong cleavage can produce reflective, stepped surfaces.

Field identification & locations

Look for dense, dark material with bright cleavage faces associated with lighter quartz; confirmatory identification may require streak, hardness, or laboratory testing. Sphalerite occurs in hydrothermal veins and carbonate-hosted deposits worldwide.