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Posnjakite (Photo)

Year of discovery: 1967 (Nura-Taldy deposit, Kazakhstan), 1973 (Japan)

Locality list: 5 localities of posnjakite

• Cu₄(SO₄)(OH)₆,H₂O
• [Cu²⁺₄][(OH)₆|SO₄]^8-,H₂O

• Class: Sulfate - Hydroxide - Hydrate

• H₂O => 2H₂O: Langite, Wroewolfeite

• Color: Blue
• Streak: Pale blue
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Thin platy

• Cleavage: Perfect
• Hardness: 2-3
• Density: 3.4

• System: Monoclinic
• Group: m, Pm
• Lattice: a=10.6, b=6.3, c=7.9, β=118.0