mineral

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Hardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, opaque, cubic or pyritohedral crystal habit, indistinct cleavage, and a specific gravity of around 5.0.

Identified August 7, 2026More mineral →

Explore Pyrite in Matrix (Fool's Gold) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, opaque, cubic or pyritohedral crystal habit, indistinct cleavage, and a specific gravity of around 5.0.

Formation & geological history

Forms in a wide variety of geological environments, from sedimentary rocks like shales and coal beds to hydrothermal vein deposits and metamorphic rocks, typically crystallizing at low to high temperatures.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and widely collected as a mineral specimen for display and jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its superficial resemblance to real gold, though pyrite is much harder, lighter in weight, and leaves a greenish-black streak.

Field identification & locations

Easily identified by its brass-yellow metallic sheen and cubic crystal forms. Found worldwide, particularly in mining regions, hydrothermal veins, and sedimentary deposits.