Native Copper in Matrix
Native Copper in Basalt/Andesite · Mineral Specimen/Industrial Mineral
Crystal System
Cubic (Isometric); habit: dendritic, massive, arborescent, or as disseminated grains
Mineral Group
Native Element
Chemical Formula
Cu (with possible traces of Ag, Fe, As)
Formation Process
Primary crystallization from hydrothermal solutions or secondary precipitation from the alteration of copper-bearing sulfides in volcanic basalt cavities.
About This Crystal
This specimen exhibits metallic, reddish-orange to copper-pink flakes and grains disseminated within a dull, fine-grained grey-brown volcanic matrix. The copper areas show a metallic luster, while the host rock is earthy and opaque. Some sections show slight mineralization or oxidation.
Physical Characteristics
Color: copper-red to pinkish; Streak: metallic copper-red; Cleavage: none; Fracture: hackly; Specific gravity: 8.94 (pure copper); Tenacity: highly malleable and ductile; Fluorescence: None.
Optical Properties
Opaque; metallic luster; shows high reflectivity characteristic of metals; no birefringence or refractive index as it is a metal.
Hardness & Durability
Origin Region
Notable sources include the Keweenaw Peninsula (Michigan, USA), Arizona, Chile, and various volcanic regions worldwide.
Hardness & Durability
Mohs hardness of 2.5 to 3 for the copper; host rock varies (typically 5-6 if basalt). Very tough and resistant to shattering, but easily scratched with a penny or knife.
Care & Maintenance
Clean with a soft damp cloth. Avoid harsh chemicals or acids which can dissolve copper. Store in a dry environment to prevent the formation of green carbonate tarnish (verdigris). Keep away from softer gems to prevent scratching.
Rarity & Value
Native copper is common globally but high-quality specimens featuring large crystals or specific matrices like this are collected by mineral enthusiasts. Value is determined by copper purity, crystal structure, and aesthetic contrast with the matrix.
Special Characteristics
Exhibits high electrical and thermal conductivity; notable for its 'native' state meaning it occurs as a pure metal naturally without being bonded to oxygen or sulfur.
Lore & History
Copper was one of the first metals used by humans, dating back over 10,000 years to the Chalcolithic period. Historically associated with the planet Venus. In folklore, it is believed to bridge the gap between physical and spiritual realms and is traditionally used in 'healing jewelry' for arthritis symptoms, though scientific evidence for this is limited.