mineral

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

AI-generated identification · may be incorrect

Hardness: 6-6.5; Color: Brass-yellow to grayish-blue with rusty oxidation; Luster: Metallic; Crystal structure: Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Hardness: 6-6
Color: Brass-yellow to grayish-blue with rusty oxidation
Luster: Metallic

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 6-6.5; Color: Brass-yellow to grayish-blue with rusty oxidation; Luster: Metallic; Crystal structure: Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Formed through hydrothermal processes in veins or as a replacement mineral in various rock types. Common in metamorphic and sedimentary environments with low oxygen and high sulfur content.

Uses & applications

Primarily an ore of sulfur and sulfuric acid; historically used to create sparks for firearms. It is a common collector specimen and sometimes used as a minor decorative stone.

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. During the 16th and 17th centuries, it was a major source of sulfur for gunpowder manufacture.

Field identification & locations

Identify by its metallic luster, heavy weight relative to size, and the smell of sulfur when struck. Common in mining districts worldwide, specifically in Peru, Spain, and the USA.