Pyrite
Pyrite · Mineral Specimen / Industrial Mineral
Crystal System
Cubic (Isometric); typically forms cubes, pyritohedrons, or octahedrons; massive or granular habit.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Hydrothermal, Magmatic, or Sedimentary; often forms in high-temperature veins or through sedimentary reduction in oxygen-poor environments.
About This Crystal
Brassy-yellow metallic mineral with a bright luster; opaque; often forms interlocking crystalline clusters with striated faces.
Physical Characteristics
Color: Pale brass-yellow; Streak: Greenish-black to brownish-black; Luster: Metallic; Fracture: Conchoidal to uneven; Specific Gravity: 4.9–5.2; Hardness: 6–6.5.
Optical Properties
Opaque; metallic reflectivity; no birefringence or pleochroism as it is isometric.
Hardness & Durability
Origin Region
Notable sources include Peru (Huanzala), Spain (Rio Tinto), Italy, and the USA; forms in hydrothermal veins and sedimentary environments.
Hardness & Durability
Mohs hardness of 6 to 6.5; brittle toughness; sensitive to oxidation and humidity which can cause 'pyrite disease'.
Care & Maintenance
Keep dry; avoid ultrasonic cleaners; clean with a soft brush and distilled water if necessary, drying immediately; store away from high humidity to prevent sulfuric acid formation.
Rarity & Value
Common; value depends on crystal size and perfection; very affordable but large aesthetic clusters or 'pyrite suns' command higher prices.
Special Characteristics
Known as 'Fool's Gold'; exhibits striking geometric crystal shapes; paramagnetic; can produce sparks when struck against steel.
Lore & History
Historically used by Native Americans as mirrors; symbolizes wealth and protection; traditionally associated with the Solar Plexus chakra for willpower and manifestation.