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Schwertmannite

Year of discovery: 1855 (Pyhäsalmi mine, Finland), 1957 (Japan)

Locality list: 6 localities of schwertmannite

• Fe₁₆O₁₆(SO₄)_3.2(OH)_9.6,10-12H₂O
• Fe₁₆O₁₆(OH,SO₄)_12-13,10-12H₂O
• [Fe³⁺₁₆][(SO₄)_3.2|O₁₆|(OH)_9.6]^48-,10-12H₂O

• Class: Sulfate - Oxide - Hydroxide - Hydrate

• Color: Yellowish brown, Iridescent
• Streak: Yellowish brown
• Luster: Earthy
• Transparency: Opaque

• Habit: Earthy, Coating

• Hardness: 1-2
• Density: 3.9

• System: Tetragonal
• Group: 4/m, P4/m
• Lattice: a=10.7, c=6.0