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Protasite

Year of discovery: 1986 (Shinkolobwe mine, Congo), 2025 (Atagoyama, Japan)

Locality list: A locality of Protasite

• Ba(UO₂)₃O₃(OH)₂,3H₂O
• [Ba²⁺][(UO₂)²⁺₃][(OH)₂|(O₃]^8-,3H₂O

• Class: Uranyl - Oxide - Hydroxide - Hydrate
• Radioactive: Very strong

• Ba => Pb: Masuyite

• Color: Orange
• Luster: Sub-adamanine
• Diaphaneity: Transparent

• Cleavage: Good on {010} (1 plane)
• Density: 5.8

• System: Monoclinic
• Group: m, Pn
• Lattice: a=12.3, b=7.2, c=7.0, β=90.4