Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric), often forming cubic, pyritohedral, or octahedral crystals, as well as massive or granular aggregates
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Forms via hydrothermal, sedimentary, and metamorphic processes across a wide range of temperatures and pressures
About This Crystal
A metallic, brass-yellow cluster displaying cubic and pyritohedral crystal faces with high reflectivity, opaque transparency, and a strong metallic luster
Physical Characteristics
Pale brass-yellow to brownish-black streak, conchoidal to uneven fracture, poor cleavage, specific gravity of approximately 5.0, brittle tenacity, and no significant fluorescence
Optical Properties
Opaque with a brilliant metallic luster, strongly reflecting light, highly reflective with no refraction or internal play of color
Hardness & Durability
Origin Region
Notable sources include Peru, Spain, Italy, and the United States; typically found in hydrothermal veins, sedimentary rocks, and metamorphic deposits
Hardness & Durability
Mohs hardness of 6 to 6.5, brittle toughness, sensitive to moisture which can cause oxidation (rusting), poor choice for everyday wear jewelry due to reactivity
Care & Maintenance
Keep dry and away from humidity to prevent tarnishing and decomposition into sulfuric acid and iron oxides; clean with a dry cloth, avoiding water and harsh chemicals
Rarity & Value
Common, widely available mineral; value depends heavily on crystal perfection, matrix presence, and size, with prices ranging from very affordable to moderate for exceptional clusters
Special Characteristics
Known for its strong metallic sheen, cubic crystal habits, and historical association as 'Fool's Gold' due to its superficial resemblance to gold
Lore & History
Historically used by ancient civilizations for striking fire and as a decorative stone; in modern metaphysical practices, it is often associated with abundance, vitality, and the solar plexus chakra, though these remain traditional beliefs rather than scientific claims