anthropic metallic specimen
Cupronickel Coin
Copper-Nickel Alloy (typically 75% Cu, 25% Ni)
Hardness: 3.5-4.0 (Mohs scale), Color: silver-white with possible oxidation, Luster: metallic, Crystal structure: face-centered cubic (FCC), Specific Gravity: approx. 8.9
- Hardness
- 3
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Physical properties
Hardness: 3.5-4.0 (Mohs scale), Color: silver-white with possible oxidation, Luster: metallic, Crystal structure: face-centered cubic (FCC), Specific Gravity: approx. 8.9
Formation & geological history
Metallurgical refinement from sulfide ores (chalcopyrite and pentlandite); technically 'formed' through industrial smelting and minting processes in the modern era.
Uses & applications
Primary use in circulating currency/coinage, corrosion-resistant marine hardware, and desalination heat exchangers.
Geological facts
Cupronickel is highly resistant to corrosion in seawater because its electrode potential is adjusted by the nickel content, making it ideal for marine environments.
Field identification & locations
Identified in the field by its silver-metallic appearance, lack of magnetism (usually), and specific weight. Found globally in urban environments as currency.
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