Chalcopyrite

CuFeS₂

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The most important copper ore mineral, chalcopyrite is a copper iron sulfide (CuFeS2) present in nearly all sulfide deposits. It crystallizes in the tetragonal system as tetrahedral or massive aggregates and carries a metallic luster, a greenish-black streak, and poor cleavage. Its brass-yellow surface often develops an iridescent tarnish. Chalcopyrite is frequently mistaken for pyrite but is set apart by a deeper yellow color, a lower Mohs hardness of 3.5 to 4, and its distinctive streak. Specific gravity ranges from 4.10 to 4.30, and the mineral remains the leading global source of copper. Its poor cleavage and conchoidal to uneven fracture further separate it from the cubic-cleaving sulfides such as galena.

Chalcopyrite is the most important copper ore mineral and occurs in virtually all sulfide deposits. It is often confused with pyrite but can be distinguished by its deeper yellow color, lower hardness, and greenish-black streak.

晶系	Tetragonal
鉱物分類	02 Sulfides and Sulfosalts
モース硬度	3.5-4.0
比重	4.10-4.30
色	Brass-yellow, often with iridescent tarnish
光沢	Metallic
条痕色	Greenish-black
劈開	Poor
断口	Conchoidal to uneven
透明度	Opaque
結晶習性	Tetrahedral, massive