mineral
Pyrite
Iron Disulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Pale brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.
Formation & geological history
Forms in a wide variety of environments including sedimentary deposits, hydrothermal veins, and as an accessory mineral in igneous rocks. Present in rocks of all geological ages.
Uses & applications
Historically a source of sulfur and sulfuric acid. Today used in jewelry (as marcasite), lapidary arts, and as an ore of iron or for the extraction of trace gold found within its lattice.
Geological facts
Commonly known as Fool's Gold due to its resemblance to real gold. Unlike gold, it is brittle and will shatter if struck, and it produces a black/green streak rather than yellow.
Field identification & locations
Identify by its cubic crystal habit, brassy luster, and hardness (it scratches glass). Found globally, notably in Spain, Italy, and the USA. Collectors look for well-defined cubes or pyritohedrons.
