Pyrite in Matrix
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric), with cubic and pyritohedral crystal habits forming a druzy cluster within a sedimentary matrix
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Hydrothermal veins, sedimentary rocks, and replacement deposits formed at various temperatures
About This Crystal
An irregular gray rock matrix featuring a prominent central vein-like depression filled with sparkling, brass-yellow metallic pyrite crystals. The pyrite exhibits small cubic and crystalline growth, creating a reflective druzy texture contrasting against the dull gray host rock.
Physical Characteristics
Brass-yellow metallic color, greenish-black to brownish-black streak, conchoidal to uneven fracture, poor cleavage, specific gravity of approximately 5.0, brittle tenacity, and metallic luster
Optical Properties
Opaque with a strong metallic reflection, isotropic in reflected light
Hardness & Durability
Origin Region
Global distribution including Peru, Spain, Italy, and the United States (notably Pennsylvania and Illinois)
Hardness & Durability
Mohs hardness of 6 to 6.5, brittle toughness, susceptible to oxidation and moisture which can cause decomposition (pyrite decay), not commonly worn in jewelry without protective settings
Care & Maintenance
Keep dry and away from high humidity to prevent oxidation and sulfuric acid formation; clean gently with a soft dry brush, avoiding water and harsh chemicals
Rarity & Value
Common, widely available as mineral specimens, with value determined by matrix aesthetics and crystal definition
Special Characteristics
Striking metallic luster, cubic crystal habit, and the ability to produce sparks when struck against steel
Lore & History
Historically known as 'Fool's Gold' due to its resemblance to actual gold; used by ancient peoples for striking fire and in various decorative items. In crystal healing, it is traditionally associated with abundance, willpower, and protection, though these are cultural beliefs rather than scientific claims.