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Jalpaite

Year of discovery: 1858 (Leonora mine, Mexico), 1969 (Japan)

Locality list: 9 localities of jalpaite

• Ag₃CuS₂
• [Ag⁺₃][Cu²⁺][S₂]

• Class: Sulfide

• Ag => Cu: Chalcocite

• Cu => Ag: Argentite, Acanthite

• Ag₃Cu => Ag₂Cu₂: Stromeyerite

• Ag_0.5 => Cu_0.5: Mckinstryite

• S => Se: Selenojalpaite

• Color: Gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Good (2 planes), prismatic
• Hardness: 2-2.5
• Density: 6.8

• System: Tetragonal
• Group: 4/mmm, I4₁/amd
• Lattice: a=8.7, c=11.8

Etymology: Jalpa district, Mexico