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Kellyite

Year of discovery: 1974 (Bald Knob deposit, USA), 1986 (Japan)

Locality list: 14 localities of kellyite

• Mn₂Al₂SiO₅(OH)₄
• (Mn,Mg,Al)₃(Al,Si)₂O₅(OH)₄
• [Mn²⁺₂][Al³⁺][(OH)₄|AlSiO₅]^7-

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

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

• Color: Yellow
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {001} (1 planes)
• Hardness: 2.5
• Density: 3.1

• System: Hexagonal
• Group: 6, P6₃
• Lattice: a=5.4, c=14.0