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Leucosphenite

Year of discovery: 1901 (Narsaarsuk pegmatite, Greenland), 1972 (Japan)

Locality list: A locality of leucosphenite

• Na₄BaTi₂B₂Si₁₀O₃₀
• [Na⁺₄][Ba²⁺][Ti⁴⁺₂][O₂|(BSi₅O₁₄)₂]^14-

• Class: Ino-Borosilicate - Oxide (Ino-Phyllo transitional)
• Fluorescence: Short UV excitation (Pale yellow)

• Color: Colorless, Pale yellow, Pale blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {010} (1 plane), Distinct on {001} (1 plane)
• Hardness: 6-6.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=16.9, c=7.2, β=93.4