Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic crystal system, commonly forming cubic, pyritohedral, or octahedral habits, frequently exhibiting striations on crystal faces.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Forms in igneous, metamorphic, and sedimentary environments under varying temperatures and pressures, frequently through hydrothermal veins and reducing sedimentary conditions.
About This Crystal
Opaque metallic specimen featuring a brassy yellow color with a cubic or rectangular blocky habit, showing distinct metallic luster and minor surface tarnish or striations.
Physical Characteristics
Metallic luster, brownish-black to greenish-black streak, distinct cubic cleavage, uneven to conchoidal fracture, specific gravity around 5.0, brittle tenacity, and non-magnetic.
Optical Properties
Opaque with a strong metallic luster, highly reflective, isotropic in reflected light.
Hardness & Durability
Origin Region
Found worldwide, with notable deposits in Spain, Peru, Italy, and the United States.
Hardness & Durability
Mohs hardness of 6 to 6.5, brittle toughness, sensitive to moisture and humidity which can cause oxidation (sulfur decay or pyrite disease).
Care & Maintenance
Keep dry and away from humidity to prevent oxidation and degradation; clean gently with a soft dry cloth; avoid water and harsh chemical cleaners.
Rarity & Value
Common mineral worldwide; value depends on perfection of crystal form, size, and matrix association, generally ranging from affordable to moderate for fine mineral specimens.
Special Characteristics
Famous for striking metallic cubic crystal habit, often nicknamed Fool's Gold, exhibits weak thermoelectric properties.
Lore & History
Historically used to create sparks for fire-starting (hence the Greek pyritēs meaning 'of fire'), and utilized by various ancient cultures for amulets and ornaments. In modern metaphysical practices, it is traditionally associated with abundance, vitality, willpower, and the solar plexus chakra.