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Gadolinite-(Y) [abbr. Gad ]

Year of discovery: 1800 (Ytterby, Sweden), 1904 (Japan)

Locality list: 55 localities of gadolinite-(Y)

• Y₂FeBe₂Si₂O₁₀
• (Y,Ce,Ca)₂FeBe₂Si₂O₁₀
• [Y³⁺₂][Fe²⁺][Be²⁺₂][O₂|(SiO₄)₂]^12-

• Class: Datolite group
• Class: Nesosilicate - Oxide
• Soluble in: HCl (Gel residue)
• Variety: Calciogadolinite (+Ca)

• Y => Ce: Gadolinite-(Ce)

• Color: Black, Greenish black
• Streak: Greenish gray
• Luster: Vitrous
• Diaphaneity: Opaque

• Habit: Granular

• Cleavage: No
• Hardness: 6.5-7
• Density: 4.5

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=10.0, b=7.6, c=4.8, β=90.3