mineral
Pyrite
Iron Sulfide (FeS2)
Hardness: 6.0-6.5 on Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal Structure: Isometric/Cubic. Streak: Greenish-black to brownish-black. Specific Gravity: 4.95-5.10.
- Hardness
- 6
- Color
- Pale brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6.0-6.5 on Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal Structure: Isometric/Cubic. Streak: Greenish-black to brownish-black. Specific Gravity: 4.95-5.10.
Formation & geological history
Forms in a wide variety of geological environments including hydrothermal veins, magmatic segregation, contact metamorphism, and sedimentary deposits rich in organic material.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, it is popular in mineral collections, costume jewelry (often sold as 'marcasite' jewelry), and ornamental crafts.
Geological facts
Nicknamed 'Fool\'s Gold' because its brassy yellow metallic luster frequently led inexperienced prospectors to mistake it for real gold. Unlike soft, malleable gold, pyrite is brittle and leaves a dark streak.
Field identification & locations
Can be identified by its distinctive metallic luster, brassy hue, hardness (scratches glass), and greenish-black streak. Common worldwide, with famous fine specimens coming from Peru, Spain, Italy, and the USA.
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