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Langite (Photo)

Year of discovery: 1864 (Fowey Consols, UK, and St Just, UK), 1970 (Japan)

Locality list: 17 localities of langite

• Cu₄(SO₄)(OH)₆,2H₂O
• [Cu²⁺₄][(OH)₆|SO₄]^8-,2H₂O

• Class: Sulfate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄, NH₃aq
• Insoluble in: Water
• Alter to Brochantite.
• Substitution pseudomorph: Replaced by Brochantite.

• Polymorph: Wroewolfeite (Monoclinic)

• 2H₂O => H₂O: Posnjakite

• Color: Sky blue, Greenish blue
• Streak: Greenish blue
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Thick tabular
• Twin: Pseudohexagonal

• Cleavage: Good on {001} and {010} (2 planes)
• Hardness: 2.5-3
• Density: 3.5

• System: Monoclinic, Pseudo-Orthorhombic
• Group: m, Pc
• Lattice: a=7.1, b=6.0, c=11.2, β=90.0