Copper

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Mineral class: Native Element
Composition: Cu
Hardness: 2.5 - 3
Luster: Metallic
Color: Copper-colored if freshly exposed; Green if weathered (oxidized). Weathers or tarnishes easily.
Streak: Copper or red
Cleavage: None
Specific Gravity: 8.93
Crystal form: Isometric
Environment: Often forms in reducing areas of sulfide deposits, cavities of basalts, or old mines flooded by copper sulfate solutions.
Uses: Electrical engineering. Alloys such as brass and bronze (with tin).
Comments: Conducts electricity. Ductile, malleable. Found around Lake Superior and in the American Southwest. Crystals rare; usually occurs in compact masses. Dissolves easily in nitric acid. Fuses at 1082 degrees C. [copper.jpg]

Mineral class:	Native Element
Composition:	Cu
Hardness:	2.5 - 3
Luster:	Metallic
Color:	Copper-colored if freshly exposed; Green if weathered (oxidized). Weathers or tarnishes easily.
Streak:	Copper or red
Cleavage:	None
Specific Gravity:	8.93
Crystal form:	Isometric
Environment:	Often forms in reducing areas of sulfide deposits, cavities of basalts, or old mines flooded by copper sulfate solutions.
Uses:	Electrical engineering. Alloys such as brass and bronze (with tin).
Comments:	Conducts electricity. Ductile, malleable. Found around Lake Superior and in the American Southwest. Crystals rare; usually occurs in compact masses. Dissolves easily in nitric acid. Fuses at 1082 degrees C.