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Goldfieldite

Year of discovery: 1909 (Mohawk mine, USA), 1938 (Japan)

Locality list: 5 localities of goldfieldite

• Cu₁₂Te₄S₁₃
• Cu₁₂(Te,As,Sb)₄S₁₃
• [Cu⁺₆][Cu⁺₄][[]][Te³⁺₄][S₁₂|S]
• The chemical composition is possibly changed to Cu₁₂(As₂Te₂)S₁₃ and/or Cu₁₂(Sb₂Te₂)S₁₃.

• Class: Goldfieldite series < Tetrahedrite group < Cu sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Te => As: Tetrahedrite-(Cu)
• Te => Sb: Tennantite-(Cu)

• Te₄ => Sb₂Te₂: Stibiogoldfieldite
• Te₄ => As₂Te₂: Arsenogoldfieldite

• Color: Dark lead gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Massive, Crust-like

• Cleavage: No
• Hardness: 3-3.5
• Density: 5.0

• System: Cubic
• Group: (-4)3m, I(-4)3m
• Lattice: a=10.3

Etymology: Goldfield, Nevada in USA, where this mineral was discovered for the first time.