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Brianyoungite

Year of discovery: 1991 (Brownley Hill mine, UK), 2001 (Japan)

Locality list: 2 localities of brianyoungite

• Zn₃(CO₃)(OH)₄
• Zn₃(CO₃,SO₄)(OH)₄
• [Zn²⁺₃][(OH)₄|CO₃]^6-

• Class: Carbonate - Hydroxide
• Fluorescence: Short UV excitation (Yellow), Long UV excitation (Bluish white)

• Color: White, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect
• Hardness: 2-2.5
• Density: 4.0

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=15.7, b=6.3, c=5.4, β=90.0