mineral

Pyrite

Iron Sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale; Color: brass-yellow, metallic gold; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: approx. 5.0

Hardness: 6-6
Color: brass-yellow, metallic gold
Luster: metallic

Identified July 3, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: brass-yellow, metallic gold; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: approx. 5.0

Formation & geological history

Forms in igneous, metamorphic, and sedimentary rocks via hydrothermal veins, contact metamorphism, or sedimentary precipitation. It can form in various environments including deep-sea vents and coal beds.

Uses & applications

Primarily used as an ore of sulfur for sulfuric acid production. It is also common in costume jewelry (often called marcasite), as a grounding stone in spiritual practices, and as a popular collector specimen.

Geological facts

Commonly known as Fool's Gold due to its resemblance to gold. Unlike gold, it is brittle and creates sparks when struck against steel. Ancient Romans used it for fire-starting.

Field identification & locations

Identify by its brassy color, cubic crystal habit, and greenish-black streak (gold has a yellow streak). Found globally, with notable deposits in Spain, Peru, and the USA.