mineral
Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Poor/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 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Forms in a wide variety of geological environments including hydrothermal veins, sedimentary rocks (via replacement), and as an accessory mineral in igneous rocks. It can form at high or low temperatures.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used for jewelry (marcasite jewelry), as an ornamental stone, and as a collector's specimen. It is also an important ore for associated gold and copper.
Geological facts
Pyrite is nicknamed 'Fool's Gold' because its color and high specific gravity can lead novice prospectors to mistake it for gold. However, pyrite is much harder than gold and brittle rather than malleable.
Field identification & locations
Identify in the field by its brassy color, metallic luster, and blackish-green streak. It can be found globally, with significant deposits in Spain, Italy, and the USA. Collectors look for well-defined cubic crystals.
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