Chalcopyrite
Chalcopyrite · Mineral Specimen / Industrial Ore
Crystal System
Tetragonal system; habit is typically massive or metallic-granular as seen in the specimen, though it can form disphenoidal crystals.
Mineral Group
Sulfides
Chemical Formula
CuFeS2 (Copper Iron Sulfide)
Formation Process
Hydrothermal; typically precipitates from hot, metal-rich fluids in volcanic or contact-metamorphic environments, often alongside pyrite and quartz.
About This Crystal
An opaque mineral with a metallic luster and a brassy yellow to golden color. Often exhibits iridescent 'peacock' tarnishing (greens, blues, purples) and a granular, rugged surface texture.
Physical Characteristics
Color: Brass-yellow (often tarnished); Streak: Greenish-black; Cleavage: Indistinct; Fracture: Uneven/brittle; Specific Gravity: 4.1–4.3; Not fluorescent.
Optical Properties
Opaque; metallic luster; shows strong rotation tints under polarized light in polished sections; no refractive index as it does not transmit light.
Hardness & Durability
Origin Region
Globally distributed; notable sources include Mexico, Arizona (USA), Peru, and Spain. Found in hydrothermal veins and porphyry copper deposits.
Hardness & Durability
Mohs hardness 3.5–4.0; brittle tenacity. It is softer than pyrite (6–6.5) and can be scratched with a steel knife.
Care & Maintenance
Avoid acidic cleaners or harsh chemicals; clean with soft dry cloth or mild soapy water. Store in a low-humidity environment to prevent oxidative tarnishing.
Rarity & Value
Very common mineral; primarily valued as the world's most important copper ore. Collector specimens are inexpensive unless perfectly crystallized.
Special Characteristics
Often confused with gold ('Fool\'s Gold') but is more brittle and has a darker streak. Prone to iridescent oxidation known as bornite-like tarnish.
Lore & History
Historically used as the primary source for copper since the Bronze Age. In metaphysical lore, it is believed to enhance perception and remove energy blockages, associated with the Crown Chakra.