Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic system, typically forming cubic, pyritohedral, or octahedral crystals, often appearing as massive or crystalline cluster aggregates.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Forms in igneous, metamorphic, and sedimentary environments under a wide range of temperatures and pressures, frequently via hydrothermal veins and sedimentary deposition.
About This Crystal
An opaque metallic mineral cluster exhibiting brass-yellow to pale golden hues with a bright metallic luster. The specimen prominently displays distinct cubic or modified octahedral crystal faces with sharp geometrical edges and striated surfaces.
Physical Characteristics
Opaque, brass-yellow body color with a greenish-black to brownish-black streak. Cleavage is indistinct, fracture is conchoidal to uneven, specific gravity is approximately 5.0, and tenacity is brittle. It is often weakly magnetic when heated.
Optical Properties
Opaque with a strong, highly reflective metallic luster. Does not exhibit typical transparent optical phenomena such as refraction or birefringence.
Hardness & Durability
Origin Region
Found worldwide, with notable fine specimens originating from Peru, Spain, Italy, and the United States (such as Colorado).
Hardness & Durability
Mohs hardness of 6 to 6.5. It is relatively hard and durable, though its brittleness means it can fracture upon sharp impact. Sensitive to moisture and humidity which can lead to oxidation.
Care & Maintenance
Keep dry and store away from high humidity to prevent oxidation and degradation (pyrite decay). Clean gently with a soft dry cloth; avoid water, harsh chemicals, steam, and ultrasonic cleaners.
Rarity & Value
Common mineral worldwide, but high-quality, large, well-formed crystal clusters are prized by collectors and command moderate to high values depending on specimen aesthetics and locality.
Special Characteristics
Famous for its deceptive metallic golden appearance, earning it the historical nickname 'Fool's Gold'. Can produce sparks when struck against steel due to its hardness and iron content.
Lore & History
Historically used by ancient civilizations for striking fire and polished into mirrors by Native Americans. In modern metaphysical practices, it is traditionally associated with abundance, vitality, willpower, and the Solar Plexus chakra.