mineral

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly mixed with chalcopyrite or other iron sulfides

AI-generated identification · may be incorrect

Brassy yellow to bronze metallic luster, granular surface, and likely Mohs hardness 6–6.5; pyrite is cubic, has no prominent cleavage, and specific gravity about 5.0. The dark matrix and rounded shape may indicate a weathered nodule rather than a crystal cluster.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sulfur-rich hydrothermal veins, sedimentary rocks, and metamorphic environments through sulfide precipitation; specimens may range from ancient sedimentary deposits to younger hydrothermal systems.

Uses & applications

Used historically as an iron and sulfur source; attractive pieces are collected as “fool’s gold,” though this rough specimen has limited jewelry use because pyrite can tarnish and oxidize.

Geological facts

Pyrite’s metallic brassy color resembles gold, but it is harder, more brittle, and commonly forms cubic crystals or granular masses.

Field identification & locations

Identify by metallic brass color, opaque appearance, brittle fracture, and dark streak; gold leaves a yellow streak and is much softer. Common localities include Peru, Spain, Italy, China, and the United States.