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Chalcopyrite (Photo) [abbr. Ccp ]

Year of discovery: 1725 (World), 1875 (Japan)

Locality list: 3,619 localities of chalcopyrite

• CuFeS₂
• [Cu²⁺][Fe²⁺][S₂]^4-

• Class: Chalcopyrite group
• Class: Sulfide
• Insoluble in: HCl
• Magnetism: Antiferromagnetic, Paramagnetic (After heating)
• Substitution pseudomorph: Replaced by Malachite.

• Cu => Ag: Lenaite

• Fe => Ga: Gallite
• Fe => In: Roquesite
• Fe => Sb: Chalcostibite
• Fe => Bi: Emplectite

• S => Se: Eskebornite (Series)

• Color: Greenish yellow
• Tarnish: Iridescent
• Streak: Greenish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Tetragon by (112) with small (-112)
• Striation: [1-10] on (112)
• Twin: {112}{012}. Intrusive twin on {110} and rotating on {001}

• Cleavage: Indistinct on {011} (2 planes)
• Hardness: 3.5-4
• Density: 4.2

• System: Tetragonal
• Group: (-4)2m, I(-4)2d
• Lattice: a=5.3, c=10.4

Etymology: Chalkos (copper) - pyr (fire) in Greek