mineral

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

AI-generated identification · may be incorrect

Brassy gray-gold metallic luster, granular/crystalline texture, uneven fracture; pyrite hardness 6–6.5 Mohs, cubic crystal system, specific gravity about 5.0. The dark appearance may reflect tarnish, fine grains, or mixed sulfides; crystal form is unclear from the image.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, sedimentary rocks, and metamorphic environments through sulfur–iron mineral precipitation. Individual crystals may be geologically ancient, commonly Paleozoic or younger depending on the host deposit.

Uses & applications

Used historically as a sulfur source and today mainly as a collector specimen; attractive crystals are decorative but generally not jewelry-grade. Industrial pyrite is occasionally processed for sulfuric-acid production.

Geological facts

Pyrite is commonly called “fool’s gold,” but it is harder, more brittle, and usually less yellow than native gold. It can oxidize in humid conditions, producing acidic iron-sulfate minerals.

Field identification & locations

Look for metallic brassy color, high density, black-green streak, and cubic or pyritohedral faces; a streak test and hardness test help distinguish it from gold. Common localities include Spain, Peru, China, Italy, and the United States.