mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Hardness: 6-6.5; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubes, pyritohedrons); Specific Gravity: 4.9-5.2; Streak: Greenish-black
- Hardness
- 6-6
- Color
- Brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubes, pyritohedrons); Specific Gravity: 4.9-5.2; Streak: Greenish-black
Formation & geological history
Forms in a wide range of geological environments: hydrothermal veins, sedimentary rocks, and metamorphic rocks. It often precipitates from sulfur-bearing fluids or organic matter decay in anaerobic conditions.
Uses & applications
Historically a source of sulfur and sulfuric acid. Today used in jewelry (as marcasite), in paper manufacturing, and as a collector specimen.
Geological facts
Known as 'Fool's Gold' because its color and luster led many novice prospectors to mistake it for real gold. It can generate sparks if struck against steel.
Field identification & locations
Identify by its brassy color, high hardness (gold is soft and can be scratched by a knife, pyrite cannot), and its greenish-black streak. Commonly found in coal beds and sedimentary shales.
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