mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 (Mohs); 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); Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Forms in high and low-temperature hydrothermal veins, as an accessory mineral in igneous rocks, and in sedimentary rocks through metamorphic or diagenetic processes. Found in all geologic ages.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, it is used for manufacturing lithium-ion batteries, as a semiconducting material, and extensively in jewelry (as marcasite) and as a collector's mineral.
Geological facts
Often mistaken for gold, hence the name 'Fool's Gold'. It can create sparks when struck against steel. Notable for frequently forming near-perfect natural cubes.
Field identification & locations
Identify in the field by its brittle nature and greenish-black streak (real gold is malleable and has a golden streak). Commonly found in Spain, Italy, Peru, and the USA. Look for the characteristic brassy luster.
