Chalcopyrite

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Mineral class: Sulfide
Composition: Copper iron sulfide, CuFeS₂
Hardness: 3.5 - 4.5
Luster: Metallic
Color: Dark yellow, irridescent tarnish
Streak: Greenish-black
Specific Gravity: 4.2
Crystal form: Tetragonal. Often poorly formed.
Environment: Typical of high-temperature hydrothermal vein deposits.
Uses: Most common copper ore
Comments:
Can be scratched by knife, but will not mark paper. Softer than pyrite.

Flame Test: Green, evolving toxic fumes.

Fuses more readily than pyrite.

Very common; associated with dolomite, galena, and sphalerite.

Brittle, may become tarnished.
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Mineral class:	Sulfide
Composition:	Copper iron sulfide, CuFeS₂
Hardness:	3.5 - 4.5
Luster:	Metallic
Color:	Dark yellow, irridescent tarnish
Streak:	Greenish-black
Specific Gravity:	4.2
Crystal form:	Tetragonal. Often poorly formed.
Environment:	Typical of high-temperature hydrothermal vein deposits.
Uses:	Most common copper ore
Comments:	Can be scratched by knife, but will not mark paper. Softer than pyrite. Flame Test: Green, evolving toxic fumes. Fuses more readily than pyrite. Very common; associated with dolomite, galena, and sphalerite. Brittle, may become tarnished.