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Fraipontite

Year of discovery: 1927 (Vieille Montagne, Belgium, Akdzhal deposit, Kazakhstan, Sterling mine, USA), 2017 (Japan)

Locality list: A locality of fraipontite

• Zn₂Al₂SiO5(OH)4
• (Zn,Cu,Al)₃(Si,Al)₂O₅(OH)₄
• [Zn²⁺₂][Al³⁺][(OH)₄|AlSiO₅]^7-

• Class: Amesite subgroup < Serpentine-Kaolin group
• Class: Phyllo-Aluminosilicate - Hydroxide

• Zn => Mg: Amesite
• Zn => Ni: Brindleyite
• Zn => Mn: Kellyite
• Zn => Fe: Berthierine

• Color: Pale blue, Pale yellow, Pale green
• Streak: White
• Luster: Silky
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect
• Hardness: 2.5
• Density: 3.5

• System: Monoclinic
• Group: (-1), P(-1)
• Lattice: a=5.3, b=9.2, c=14.1, β=93.2