mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 Mohs; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2
- Hardness
- 6-6
- Color
- Brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Forms in sedimentary rocks as nodules, in magmatic segregations, and in hydrothermal veins. It can form across various geological ages when iron and sulfur are present.
Uses & applications
Source of sulfur and sulfuric acid; historical use as a spark generator; decorative purposes and collector specimens.
Geological facts
Commonly known as Fool's Gold due to its resemblance to precious metals. It was used in the first wheel-lock muskets to provide the spark for the gunpowder.
Field identification & locations
Identify by brittle nature and dark green to black streak test (unlike gold). Found worldwide, specifically in Peru, Spain, and the USA.
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