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Ferrihydrite

Year of discovery: 1973 (Belousovskii mine, Kazakhstan, and Ridder mine (Leninogorsk mine), Kazakhstan), 1990 (Japan)

Locality list: 6 localities of ferrihydrite

• Fe₅O₃(OH)₉
• Fe₅(OH,O)₁₂
• [Fe³⁺₅][(OH)₉|O₃]^15-

• Class: Oxide - Hydroxide

• Color: Dark brown-Yellowish brownk
• Streak: Yellowish brown

• Density: 3.8

• System: Trigonal (2-line), Trigonal (6-line) (Order-Disorder polytype)
• Group: (-3)2/m, P(-3)1c
• Lattice: a=3.0, c=9.4