Schwertmannite
Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters". Schwertmannite is an iron-oxyhydroxysulfate mineral with an ideal chemical formula of Template:Chem2 or Template:Chem/link.[1] 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.[2]
It was first described for an occurrence in Finland in 1994 and named for Udo Schwertmann (born 1927), a soil scientist at the Technical University of Munich, Munich, Germany.[3]
Schwertmannite (with a distinct "pin cushion" morphology) commonly forms in iron-rich, acidic 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.[4] However, it is more commonly reported as an orange precipitate in streams and lakes affected by acid mine drainage.[5] Schwertmannite is also known to be central to iron-sulfur geochemistry in acid sulfate soils associated with coastal lowlands.[6]
See also
- Alunite Script error: No such module "String". (Template:Chem2)
- Jarosite (Template:Chem2)
References
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- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ https://rruff.geo.arizona.edu/doclib/hom/schwertmannite.pdf Mineral Handbook
- ↑ Bigham, J.M., Carlson, L., Murad, E. (1994). Schwertmannite, a new iron oxyhydroxysulfate from Pyhasalmi, Finland, and other localities. Mineral Mag 58, 641–664.
- ↑ Bigham, J.M., Schwertmann, U., Carlson, L., Murad, E. (1996). Schwertmannite and the chemical modeling of iron in acid sulfate waters. Geochimica et Cosmochimica Acta 54, 2743–2758.
- ↑ Burton, E.D., Bush, R.T., Sullivan, L.A. (2007). Reductive transformation of iron and sulfur in schwertmannite-rich accumulations associated with acidified coastal lowlands. Geochimica et Cosmochimica Acta 71, 4456–4473.
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