mineral
Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2
- Hardness
- 6-6
- Color
- Brass-yellow, metallic gold
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Formed in various environments including hydrothermal veins, sedimentary rocks as a replacement mineral, and metamorphic rocks. It often forms through the reaction of hydrogen sulfide with iron-bearing minerals.
Uses & applications
Primarily used in the production of sulfuric acid and sulfur dioxide. It was historically used as an ignition source in wheel-lock firearms and is now popular as a collector's mineral and in costume jewelry.
Geological facts
Known as 'Fool's Gold' because its color and metallic luster frequently lead beginners to mistake it for gold. It is unique among common minerals for its perfect cubic crystal shapes.
Field identification & locations
Identify by its brassy color, high hardness (it can scratch glass, whereas gold cannot), and its green-black streak when rubbed on a porcelain plate. Common worldwide, particularly in Rio Tinto (Spain) and various locations in the USA.
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