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Amesite [abbr. Ame ]

Year of discovery: 1876 (Chester mine, USA), 1944 (Japan)

Locality list: 11 localities of amesite

• Mg₂Al₂SiO5(OH)4
• [Mg²⁺₂][Al³⁺][(OH)₄|AlSiO₅]^7-

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

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

• Color: Colorless, Purple, Pale green
• Streak: Pale green
• Luster: Pearly
• Diaphaneity: Transparent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2.5-3
• Density: 2.8

• System: Triclinic, Hexagonal (2H₁, 2H₂), Trigonal (6R₁, 6R₂) (Layer-stacking polytype)
• Group: 1, C1
• Lattice: a=5.3, b=9.2, c=14.1, α=90.1, β=90.3, β=90.0