mineral

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides

AI-generated identification · may be incorrect

Brassy yellow metallic luster with irregular massive texture; pyrite hardness is 6–6.5 Mohs, cubic crystal structure, poor cleavage, and specific gravity about 5.0. The dull brown areas likely represent oxidation or host rock; image-based identification is uncertain.

Identified September 21, 2026More mineral →

Explore Pyrite-bearing sulfide specimen in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms in hydrothermal veins, sedimentary rocks, and metamorphic environments when iron and sulfur combine, commonly from Paleozoic to younger deposits. Oxidation produces the brown surface coating.

Uses & applications

Collected as a mineral specimen and used historically as a sulfur source; pyrite is not typically used as a gemstone, though polished pieces are decorative. Associated sulfide ores may be economically important for copper, zinc, gold, or other metals.

Geological facts

Often called “fool’s gold,” but it is harder and more brittle than gold and commonly shows cubic crystals or straight-edged fracture surfaces. Chalcopyrite can create a more uneven, greenish-brassy appearance.

Field identification & locations

Test for a dark streak, brittleness, and lack of gold’s malleability; a steel nail generally does not scratch fresh pyrite. Common localities include Spain, Peru, Italy, China, and many hydrothermal ore districts worldwide.