[ Top ] [ Japanese ]

Lamprophyllite

Year of discovery: 1894 (Kola Peninsula, Russia), 1998 (Japan)

Locality list: A locality of lamprophyllite

• Na₄SrTi₃Si₄O₁₆(OH)₂
• (Na,Ti,Mn²⁺,Fe³⁺)₄(Sr,K,Ba)Ti₃Si₄O₁₆(OH,F)₂
• [Na⁺₄][Sr²⁺][Ti⁴⁺₃][(OH)₂|O₂|(Si₂O₇)₂]^18-

• Class: Sorosilicate - Oxide - Hydroxide

• Color: Yellow
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Good on {100} (1 plane)
• Hardness: 2.5
• Density: 3.4

• System: Monoclinic (2M), Orthorhombic (2O) (Layer-stacking polytype)
• Group: 2/m, C2/m
• Lattice: a=19.8, b=7.1, c=5.4, β=96.5