mineral
Pyrite
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); 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 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Forms in diverse environments including magmatic segregation, hydrothermal veins, and as an authigenic mineral in sedimentary rocks. Found throughout all geological ages.
Uses & applications
Used industrially as a source of sulfur and sulfuric acid. Historically used to create sparks for firearms. Frequently sold as mineral specimens and used in costume jewelry (often sold as 'marcasite').
Geological facts
Commonly known as 'Fool's Gold' due to its resemblance to real gold, though it is much harder and more brittle. It can produce sparks when struck against steel.
Field identification & locations
Identify by its brassy color, cubic crystal habit, and greenish-black streak (gold has a yellow streak). It is common worldwide, with major deposits in Spain, Peru, and the USA.
