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Cuprotungstite

Year of discovery: 1869 (La Paz, Mexico), 1900 (Japan)

Locality list: 7 localities of cuprotungstite

• Cu₃(WO₄)₂(OH)₂
• [Cu²⁺₃][(OH)₂|(WO₄)₂]^6-

• Class: Tungstate - Hydroxide
• Soluble in: HCl, HNO₃, H₂SO₄
• Fluorescence: UV excitation (Yellow)
• Formed by alteration of Scheelite.
• Substitution pseudomorph: Replace Scheelite.

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

• Hardness: 4-5
• Density: 7.0

• System: Tetragonal
• Group: 422, P4₁2₁2
• Lattice: a=8.9, c=14.5