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β-Uranophane

Year of discovery: 1935 (Jáchymov, Czech), 1956 (Japan)

Locality list: 12 localities of β-uranophane

• Ca(UO₂)₂Si₂O₆(OH)₂,5H₂O
• [Ca²⁺][(UO₂)²⁺₂][(HSiO₄)₂]^6-,5H₂O

• Class: Uranophane group
• Class: Uranyl - Nesosilicate - Hydrate
• Fluorescence: UV excitation (Green)
• Radioactive: Very strong

• Polymorph: Uranophane (Monoclinic)

• Ca => Cu: Cuprosklodowskite
• Ca => Co: Oursinite
• Ca => Mg: Sklodowskite

• Color: Yellowish green, Yellow
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {010} (1 plane), Poor on {100} (1 plane)
• Hardness: 2.5-3
• Density: 3.9

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=14.0, b=15.4, c=6.6, β=91.4

Synonym: Uranophane-β