mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Cubic or pyritohedron; 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: Cubic or pyritohedron; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.
Formation & geological history
Formed in a variety of environments, including magmatic segregation, hydrothermal veins, and sedimentary deposits under low-oxygen conditions. It can be found in rocks of all geological ages, from Precambrian to recent.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used in the production of sulfur dioxide for the paper industry, in jewelry (often sold as 'marcasite'), and as a popular collector's specimen.
Geological facts
Pyrite gets its name from the Greek 'pyr' (fire) because it creates sparks when struck against metal or stone. It is famous for mimicking the appearance of gold, leading to its nickname 'Fool's Gold', though it is much harder and more brittle.
Field identification & locations
Identify in the field by its metallic luster, golden color, and blackish-green streak on a porcelain plate. Common locations include high-temperature hydrothermal veins and sedimentary coal beds. Collectors should look for well-defined cubic crystals.
