Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric); typically forms cubic, pyritohedral, or octahedral crystals, often appearing here as a massive or granular aggregate with exposed micro-faces.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Hydrothermal and sedimentary processes; forms under a wide range of temperatures in reducing environments, often replacing organic material or precipitating from sulfur-rich hydrothermal solutions.
About This Crystal
A small, metallic, brass-yellow nugget showing characteristic glittering cubic crystal faces and a high reflective luster, opaque with a metallic sheen.
Physical Characteristics
Color: Pale brass-yellow. Streak: Greenish-black to brownish-black. Cleavage: Indistinct. Fracture: Conchoidal to uneven. Specific Gravity: 4.8 - 5.0. Tenacity: Brittle.
Optical Properties
Opaque with a strong metallic luster; exhibits high reflectivity and anisotropic properties under reflected light microscopy.
Hardness & Durability
Origin Region
Found globally; notable sources include Peru, Spain, Italy, and the USA. Forms in hydrothermal veins, sedimentary rocks, and metamorphic deposits.
Hardness & Durability
Mohs hardness of 6 to 6.5. Brittle and sensitive to moisture which can cause oxidation (rusting) over time.
Care & Maintenance
Keep dry and store away from high humidity to prevent oxidation. Clean with a dry cloth; avoid water and harsh chemicals.
Rarity & Value
Common; widely available worldwide. Value depends on specimen size, perfection of crystal forms, and matrix presentation.
Special Characteristics
Famous for its deceptive metallic gold appearance, earning it the nickname 'Fool's Gold'. Can spark when struck against steel due to high hardness and friction.
Lore & History
Historically used to strike fire in ancient times. In metaphysical traditions, it is associated with abundance, vitality, and protection against negative energy, linked primarily to the solar plexus chakra.