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Thalénite-(Y), Thalenite-(Y)

Year of discovery: 1898 (Österby, Sweden), 1951 (Japan)

Locality list: 10 localities of thalénite-(Y)

• Y₃Si₃O₁₀(OH)
• [Y³⁺₃][OH|Si₃O₁₀]^9-

• Class: Sorosilicate - Hydroxide

• OH => F: Fluorthalénite-(Y) (Fluorthalenite-(Y))

• Color: Pink, Brown, Greenish brown
• Streak: White
• Luster: Greasy
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 6
• Density: 4.2

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=10.3, b=11.1, c=7.3, β=96.9