Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric), typically forming cubes, pyritohedrons, and octahedral crystals, often massive or granular
Mineral Group
Sulfdes
Chemical Formula
FeS2
Formation Process
Forms in igneous, metamorphic, and sedimentary environments, frequently through hydrothermal veins and low-temperature aqueous solutions
About This Crystal
The specimen exhibits a dense aggregate of micro-crystals with a strong brassy-yellow metallic luster and a granular, glittering appearance reminiscent of gold
Physical Characteristics
Brass-yellow color, greenish-black streak, conchoidal to uneven fracture, specific gravity of approximately 5.0, brittle tenacity, and metallic luster
Optical Properties
Opaque with a high reflective metallic luster, completely isotropic due to the cubic crystal system
Hardness & Durability
Origin Region
Found worldwide, with notable deposits in Peru, Spain, Italy, and the United States
Hardness & Durability
Mohs hardness of 6 to 6.5, brittle with poor cleavage, making it susceptible to chipping if struck
Care & Maintenance
Clean with a soft dry cloth; avoid moisture and water exposure as pyrite reacts with humidity to form sulfuric acid and iron oxide (rust)
Rarity & Value
Common mineral with moderate value depending on specimen aesthetics, matrix quality, and crystal perfection
Special Characteristics
Known colloquially as 'Fool's Gold' due to its superficial resemblance to gold; produces sparks when struck against steel
Lore & History
Historically used as a fire starter due to its ability to produce sparks; associated with abundance, vitality, and protection in traditional crystal healing