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Greenalite [abbr. Gre ]

Year of discovery: 1903 (Biwabik, USA), 1938 (Japan)

Locality list: 31 localities of greenalite

• (Fe²⁺,Fe³⁺)_2-3Si₂O₅(OH)₄
• [Fe²⁺₃][(OH)₄|Si₂O₅]^6-

• Class: 1:1 layer, Island-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide
• Soluble in: HCl
• Magnetism: Paramagnetic (Moderate)
• Variety: Tosalite (+Mn)

• Fe => Mg: Antigorite, Chrysotile, Lizardite
• Fe => Ni: Népouite(Nepouite)
• Fe => Mn: Caryopilite

• Color: Green, Pale yellow-green
• Streak: Greenish gray
• Luster: Earthy
• Diaphaneity: Translucent-Opaque

• Cleavage: No
• Hardness: 2.5
• Density: 3.0

• System: Trigonal (3R), Monoclinic (1M, 2M₁), Triclinic (1A, 2A, 3A) (Layer-stacking polytype)
• Lattice: a=5.5, b=9.6, c=7.4, β=104.2