mineral
Pyrite
Iron Pyrite (FeS2)
Hardness: 6-6.5 on Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Pale brass-yellow to golden
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 on Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.
Formation & geological history
Formed in high and low temperature hydrothermal veins, by magmatic segregation, and as an accessory mineral in igneous and sedimentary rocks. Common in coal beds and as a replacement mineral in fossils.
Uses & applications
Historically a source of sulfur and sulfuric acid. Used in jewelry (marketed as 'marcasite'), as a grit for grinding, and as a popular specimen for mineral collectors.
Geological facts
Widely known as 'Fool's Gold' because its color and metallic luster often led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and produces a greenish-black streak when rubbed on a porcelain plate.
Field identification & locations
Identify in the field by its brassy color, cubic crystal habit, and hardness (it can scratch glass). Found globally, with notable deposits in Spain, Peru, and the United States (Arizona, Colorado, Pennsylvania).
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