Pyrite Cluster with Quartz
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric); forms as cubes, pyritohedrons, and massive aggregates with striated faces
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Hydrothermal veins, sedimentary rocks, and metamorphic deposits at varying temperatures
About This Crystal
Brass-yellow metallic cluster displaying high reflectivity, intergrown crystal faces, and minor white quartz matrix inclusions
Physical Characteristics
Brass-yellow color, greenish-black to brownish-black streak, conchoidal to uneven fracture, specific gravity of approximately 5.0
Optical Properties
Opaque with a brilliant metallic luster; isotropic in reflected light
Hardness & Durability
Origin Region
Global distribution; notable sources include Peru, Spain, Italy, and the United States
Hardness & Durability
Mohs hardness of 6 to 6.5; brittle tenacity; sensitive to moisture which can cause oxidation
Care & Maintenance
Keep dry and away from humidity to prevent tarnishing and degradation; clean gently with a soft dry cloth
Rarity & Value
Common; value depends on crystal definition, matrix association, and overall cluster aesthetics
Special Characteristics
Famous for its striking metallic brass color and cubic habit, earning the nickname 'Fool's Gold', along with weak piezoelectric properties
Lore & History
Historically used by ancient civilizations for fire-making and ornamentation; associated in modern metaphysical practices with abundance, vitality, and the solar plexus chakra