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Volborthite

Year of discovery: 1838 (Sofronovskii mine, Russia), 1989 (Japan)

Locality list: 2 localities of volborthite

• Cu₃V₂O₇(OH)₂,2H₂O
• [Cu²⁺₃][(OH)₂|V₂O₇]^6-,2H₂O

• Class: Pyrovanadate - Hydroxide - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄

• Cu => Zn: Martyite

• Color: Yellowish green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Platy

• Cleavage: Perfect (1 plane)
• Hardness: 3.5
• Density: 3.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.6, b=5.9, c=7.2, β=95.0