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Epistilbite

Year of discovery: 1826 (Teigarhorn, Iceland, and Breiðdalur-Berufjörður area, Iceland), 1899 (Japan)

Locality list: 34 localities of epistilbite

• CaAl₂Si₆O₁₆,5H₂O
• [Ca²⁺][Al₂Si₆O₁₆]^2-,5H₂O

• Class: Mordenite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Decompose)
• Electrical: Piezoelectric

• Polymorph: Goosecreekite (Monoclinic)

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

• Habit: Thin Prismatic

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 4
• Density: 2.3

• System: Monoclinic
• Lattice: a=9.1, b=17.7, c=10.3, β=124.5