Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric), with cubic and pyritohedral crystal habits and striations common on crystal faces.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Hydrothermal, sedimentary, and igneous processes, typically forming at high to moderate temperatures in hydrothermal veins or reducing sedimentary environments.
About This Crystal
An opaque, metallic cluster with a brassy-yellow to silvery-white color and strong reflective luster, featuring well-defined cubic crystal faces and striated surfaces.
Physical Characteristics
Color is pale brass-yellow, streak is greenish-black to brownish-black, cleavage is indistinct, fracture is conchoidal to uneven, specific gravity is approximately 5.0, tenacity is brittle.
Optical Properties
Opaque with a strong metallic luster. Not applicable for standard refractive index or birefringence as light does not transmit through the mineral.
Hardness & Durability
Origin Region
Found globally with major deposits in Peru, Spain, Italy, and the USA. Forms in igneous, sedimentary, and metamorphic environments.
Hardness & Durability
Mohs hardness of 6 to 6.5, brittle toughness, moderately stable but can oxidize in moist environments to form iron oxides (rust).
Care & Maintenance
Keep dry and away from humidity to prevent oxidation. Clean with a dry cloth; avoid water and harsh chemical immersion.
Rarity & Value
Common, widely available as mineral specimens and affordable for collectors, though high-end crystalline clusters command higher prices.
Special Characteristics
Known as 'Fool's Gold' due to its metallic luster and brassy hue, exhibits striations on crystal faces, and can produce sparks when struck against steel due to friction.
Lore & History
Historically used to strike fire in ancient times and polished by Native Americans as mirrors. In modern metaphysical practices, it is associated with abundance, vitality, and the solar plexus chakra.