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Analcime (Photo) [abbr. Anl ]

Year of discovery: 1801 (Cyclopean islands, Italy), 1885 (Japan)

Locality list: A locality of analcime

• Na₂Al₂Si₄O₁₂,2H₂O
• [Na⁺₂][Al₂Si₄O₁₂]^2-,2H₂O

• Class: Analcime group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)
• Fluorescence: UV excitation (Blue green-Green-Yellow)
• Electrical: Piezoelectric (Weak), Electrostatic (Weak, Rubbed or Heated)
• Substitution pseudomorph: Replaced by Ammonioleucite.

• Polytype: Changing symmetry by Al-Si arrangements to be Cubic, Tetragonal, Orthorhombic, Monoclinic, and Triclinic.

• Na => Cs: Pollucite (Series)
• Na₂ => Ca: Wairakite (Series)

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

• Habit: Trapezohedral

• Cleavage: Indistinct on {100}, {010}, {001} (3 planes)
• Hardness: 5-5.5
• Density: 2.2

• System: Triclinic, Pseudocubic
• Group: 1, P1
• Lattice: a=13.7, b=13.7, c=13.7, α=90.2, β=90.0, γ=90.0

Etymology: Analkis (Week) in Greek, as it is charged electricity by friction.