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Mesolite (Photo) [abbr. Mes ]

Year of discovery: 1816 (World), 1917 (Japan)

Locality list: 29 localities of mesolite

• Na₂Ca₂Al₆Si₉O₃₀,8H₂O
• [Na⁺₂][Ca²⁺₂][(Al₂Si₃O₁₀)₃]^6-,8H₂O

• Class: Natrolite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)
• Electrical: Piezoelectric (Very weak), Pyroelectric (Very weak)

• Na₂ => Ca: Scolecite, Cowlesite

• Ca₂ => Na₄: Natrolite, Gonnardite, Paranatrolite

• Na₂Ca₂ => Ba₃: Edingtonite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Habit: Acicular
• Aggregate: Radial

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 5
• Density: 2.3

• System: Orthorhombic
• Group: mm2, Fdd2
• Lattice: a=18.4, b=56.7, c=6.5

• Non-coexist: Quartz, Mordenite

Etymology: Mesos (Middle) in Greek