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Brannerite

Year of discovery: 1920 (Kelley Gulch, USA), 1959 (Japan)

Locality list: A locality of brannerite

• UTi₂O₆
• (U⁴⁺,Y³⁺,Ce³⁺,Th⁴⁺,Ca)(Ti,Fe³⁺,Nb)₂(O,OH)₆
• [U⁴⁺][Ti₂O₆]^4-

• Class: Dititanate
• Soluble in: HCl, concentrated hot H₂SO₄ (Decompose)
• Radioactive: Very strong

• Polymorph: Uranopolycrase (Orthrhombic)

• U => Th; Thorutite (Series)

• [] => OH: Orthobrannerite

• Color: Black, Greenish brown
• Streak: Dark greenish brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 4.5-5.5
• Density: 5.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=3.8, c=6.9, β=119.0