page_title: Schwertmannite
hierarchical_section_title: Schwertmannite
caption_attribution_description: Català: Crosta de schwertmannita obtinguda de zona de drenatge àcid de mines, Corta Atalaya, Huelva, Andalusia. Mida: 3x2x0,4 cm
context_page_description: Schwertmannite is an iron-oxyhydroxysulfate mineral with an ideal chemical formula of Fe₈O₈(OH)₆·nH₂O
  or Fe³⁺₁₆O₁₆(OH, SO₄)₁₂₋₁₃·10-12H₂O. It is an opaque tetragonal mineral typically occurring as brownish yellow encrustations. It has a Mohs hardness of 2.5 - 3.5 and a specific gravity of 3.77 - 3.99.
  It was first described for an occurrence in Finland in 1994 and named for Udo Schwertmann soil scientist, Technical University of Munich, Munich, Germany.
  Schwertmannite commonly forms in iron-rich, acid sulfate waters in the pH-range of 2 - 4. The mineral was first recognised officially as a new mineral from a natural acid-sulfate spring occurrence at Pyhäsalmi, Finland. However, it is more commonly reported as an orange precipitate in streams and lakes affected by acid mine drainage. Schwertmannite is also known to be central to iron-sulfur geochemistry in acid sulfate soils associated with coastal lowlands.
context_section_description: Schwertmannite is an iron-oxyhydroxysulfate mineral with an ideal chemical formula of Fe₈O₈(OH)₆(SO₄)·nH₂O  
  or Fe³⁺₁₆O₁₆(OH,SO₄)₁₂₋₁₃·10-12H₂O. It is an opaque tetragonal mineral typically occurring as brownish yellow encrustations. It has a Mohs hardness of 2.5 - 3.5 and a specific gravity of 3.77 - 3.99.
  It was first described for an occurrence in Finland in 1994 and named for Udo Schwertmann (born 1927) soil scientist, Technical University of Munich, Munich, Germany.
  Schwertmannite (with a distinct "pin cushion" morphology) commonly forms in iron-rich, acid sulfate waters in the pH-range of 2 - 4. The mineral was first recognised officially as a new mineral from a natural acid-sulfate spring occurrence at Pyhäsalmi, Finland.  However, it is more commonly reported as an orange precipitate in streams and lakes affected by acid mine drainage. Schwertmannite is also known to be central to iron-sulfur geochemistry in acid sulfate soils associated with coastal lowlands.
caption: Schwertmannite
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