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Meionite [abbr. Mei ]

Year of discovery: 1801 (Monte Somma, Italy), 1938 (Japan)

Locality list: 3 localities of meionite

• Ca₄Al₆Si₆O₂₄CO₃
• [Ca²⁺₄][CO₃|(AlSiO₄)₆]^8-

• Class: Scapolite group
• Class: Tecto-Aluminosilicate - Carbonate
• Fluorescence: UV excitation (Yellow-Red)

• CO₃ => SO₄: Silvialite

• Ca₄Al₃CO₃ => Na₄Si₃Cl: Marialite (Series)

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

• Habit: Prismatic
• Aggregate: Columnar

• Cleavage: Distinct on {100} and {110} (5 planes)
• Hardness: 5-6
• Density: 2.7

• System: Tetragonal
• Group: 4/m, I4/m
• Lattice: a=12.2, c=7.6