mineral

Pyrite with galena and sphalerite

Pyrite (FeS₂), commonly intergrown with galena (PbS) and sphalerite (ZnS)

AI-generated identification · may be incorrect

Brassy metallic pyrite forms cubic crystals, with silvery-gray galena and dark red-brown to black sphalerite. Pyrite hardness is 6–6.5 Mohs; galena is 2.5–2.75 and shows perfect cubic cleavage; sphalerite is 3.5–4. Lusters are metallic to resinous, and the specimen is likely dense (specific gravity roughly 4–7.5).

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

These sulfide minerals typically crystallize from hot hydrothermal fluids in veins, replacement deposits, and volcanogenic massive-sulfide systems, ranging from Precambrian to recent geological ages. The image appears to show a mineral-rich ore specimen rather than a single rock type.

Uses & applications

Collected for sharp crystal forms and metallic contrast; pyrite is used industrially for sulfur and sulfuric acid, while galena and sphalerite are major lead and zinc ores. Attractive specimens may be displayed, though galena-bearing material should be handled and stored responsibly.

Geological facts

Pyrite is often called “fool’s gold,” but its cubic crystals and black streak distinguish it from gold. Galena’s unusually high density and cubic cleavage are especially diagnostic.

Field identification & locations

Identify by metallic luster, heavy feel, cubic pyrite crystals, galena’s blocky cleavage, and sphalerite’s resinous luster; common localities include Peru, Mexico, Spain, China, Morocco, and the United States. Avoid inhaling dust or prolonged handling because lead-bearing specimens can be toxic.