mineral

Small metallic mineral specimen, possibly pyrite

Pyrite (FeS₂), tentative identification

AI-generated identification · may be incorrect

Tiny brassy-gold, metallic, irregular crystalline grain; pyrite has Mohs hardness 6–6.5, cubic crystal structure, poor cleavage, and specific gravity about 5.0. The image is too small for confident confirmation; chalcopyrite or a metal fragment are alternatives.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Natural pyrite forms hydrothermally or in sedimentary rocks from sulfide-bearing fluids, ranging from ancient to modern geological ages. It commonly occurs in veins, coal beds, shale, and quartz-rich rocks.

Uses & applications

Used chiefly as a sulfur and iron source historically, and commonly collected as “fool’s gold”; attractive crystals may be sold as inexpensive specimens.

Geological facts

Pyrite’s metallic luster and brassy color resemble gold, but it is harder, more brittle, and usually forms angular or cubic crystals. It can oxidize and produce acidic sulfate minerals when exposed to moisture.

Field identification & locations

Look for a brassy—not yellow—color, black-green streak, brittle fracture, and cubic faces; gold is softer and leaves a yellow streak. Common localities include Peru, Spain, Italy, China, and the United States.