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Berthierine

Year of discovery: 1832 (Hayange, France), 1973 (Japan)

Locality list: 13 localities of berthierine

• Fe₃Si₂O₅(OH)₄
• (Fe²⁺,Fe³⁺,Mg)_2-3(Si,Al)₂O₅(OH)₄
• [Fe²⁺₃][(OH)₄|Si₂O₅]^6-

• Class: Amesite subgroup < Serpentine-Kaolin group
• Class: Phyllosilicate - Hydroxide

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

• Color: Dark green-Yellowish green
• Streak: Pale green
• Luster: Pearly
• Diaphaneity: Translucent

• Hardness: 2.5
• Density: 3.0

• System: Monoclinic (1M), Hexagonal (1H) (Layer-stacking polytype)
• Group: m, Cm
• Lattice: a=5.3, b=9.1, c=7.1, β=104.5