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Banalsite

Year of discovery: 1944 (Benallt mine (Tyddyn Meirion mine), UK), 1985 (Japan)

Locality list: 3 localities of banalsite

• Na₂BaAl₄Si₄O₁₆
• [Na⁺₂][Ba²⁺][(Al₂Si₂O₈)₂]^4-

• Class: Banalsite group
• Class: Tecto-Aluminosilicate

• Ba => Sr: Stronalsite (Series)
• Ba => Ca: Lisetite

• Color: White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {110} and {001} (3 planes)
• Hardness: 6
• Density: 3.1

• System: Orthorhombic
• Group: mm2, Iba2
• Lattice: a=8.5, b=10.0, c=16.8

Etymology: Chemical composition