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Soddyite

Year of discovery: 1922 (Shinkolobwe mine (Kasolo mine), Congo (Zaïre)), 1978 (Japan)

Locality list: A locality of soddyite

• (UO₂)₂SiO₄,2H₂O
• [(UO₂)²⁺₂][SiO₄]^4-,2H₂O

• Class: Uranyl - Nesosilicate - Hydrate
• Soluble in: HCl (Gel residue)
• Fluorescence: UV excitation (Orange)
• Radioactive: Very strong

• Color: Yellow
• Streak: Yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Cleavage: Perfect on {001} (1 plane), Good on {111} (4 planes)
• Hardness: 3-4
• Density: 4.6

• System: Orthorhombic
• Group: mmm, Fddd
• Lattice: a=8.3, b=11.2, c=18.7