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Thorite [abbr. Thr ]

Year of discovery: 1829 (Løvøya, Norway), 1947 (Japan)

Locality list: 32 localities of thorite

• ThSiO₄
• (Th,U)SiO₄
• [Th⁴⁺][SiO₄]^4-

• Class: Zircon group
• Class: Nesosilicate
• Variety: Uranothorite (+U)
• Variety: Enalite (+U,REE,P)
• Soluble in: HCl (Gel residue)
• Radioactive: Very strong

• Th => Zr: Zircon, Reidite
• Th => Hf: Hafnon
• Th => Ce: Stetindite

• SiO₄ => (OH)₄: Thorogummite

• Color: Yellow, Yellowish brown, Green, Black
• Streak: Pale brown
• Luster: Resinous
• Diaphaneity: Opaque

• Cleavage: Poor on {110} (2 planes)
• Hardness: 4.5
• Density: 5.3

• System: Tetragonal
• Group: 4/mmm, I4₁/amd
• Lattice: a=7.1, c=6.3