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Yarrowite

Year of discovery: 1978 (Yarrow Creek, Canada), 2001 (Japan)

Locality list: 3 localities of yarrowite

• Cu₉S₈
• [Cu₉][S₈]

• Class: Sulfide

• Cu₉ => Cu₁₆: Chalcocite (Series)

• Color: Bluish black
• Tarnish: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Distinct on {0001} (1 plane)
• Hardness: 2.5
• Density: 4.9

• System: Trigonal
• Group: 3m, P3m1
• Lattice: a=3.8, c=67.3

Etymology: Yarrow creek, Canada, where this mineral was discovered for the first time.