Schwertmannite is an iron-oxyhydroxysulfate mineral with an ideal chemical formula of Fe8O8(OH)6(SO4) · n H2O or Fe3+ 16O 16(OH,SO4) 12–13·10-12H 2O.[2] 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.[3]
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.[4]
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.[5] However, it is more commonly reported as an orange precipitate in streams and lakes affected by acid mine drainage.[6] Schwertmannite is also known to be central to iron-sulfur geochemistry in acid sulfate soils associated with coastal lowlands.[7]
^Bigham, JM, Carlson, L, Murad, E (1994) Schwertmannite, a new iron oxyhydroxysulfate from Pyhasalmi, Finland, and other localities. Mineral Mag 58, 641-664
^Bigham, JM, 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, ED, Bush, RT, Sullivan, LA (2007) Reductive transformation of iron and sulfur in schwertmannite-rich accumulations associated with acidified coastal lowlands. Geochimica et Cosmochimica Acta 71, 4456-4473
This article about a specific sulfate mineral is a stub. You can help Wikipedia by expanding it.
schwertmannite, iron, oxyhydroxysulfate, mineral, with, ideal, chemical, formula, fe8o8, 12h2, opaque, tetragonal, mineral, typically, occurring, brownish, yellow, encrustations, mohs, hardness, specific, gravity, generalcategorysulfate, mineralsformula, repea. Schwertmannite is an iron oxyhydroxysulfate mineral with an ideal chemical formula of Fe8O8 OH 6 SO4 n H2O or Fe3 16 O16 OH SO4 12 13 10 12H2 O 2 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 3 SchwertmanniteGeneralCategorySulfate mineralsFormula repeating unit Fe8O8 OH 6 SO4 n H2OIMA symbolSwm 1 Strunz classification7 DE 15Crystal systemTetragonal Dipyramidal classSpace groupTetragonal H M symbol 4 m Space group P4 mIdentificationColorbrownish yellowLusterearthyStreakyellowDiaphaneityopaqueReferences 2 3 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 4 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 Pyhasalmi Finland 5 However it is more commonly reported as an orange precipitate in streams and lakes affected by acid mine drainage 6 Schwertmannite is also known to be central to iron sulfur geochemistry in acid sulfate soils associated with coastal lowlands 7 References edit Warr L N 2021 IMA CNMNC approved mineral symbols Mineralogical Magazine 85 3 291 320 Bibcode 2021MinM 85 291W doi 10 1180 mgm 2021 43 S2CID 235729616 a b Mindat a b http webmineral com data Schwertmannite shtml Webmineral http rruff geo arizona edu doclib hom schwertmannite pdf Mineral Handbook Bigham JM Carlson L Murad E 1994 Schwertmannite a new iron oxyhydroxysulfate from Pyhasalmi Finland and other localities Mineral Mag 58 641 664 Bigham JM 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 ED Bush RT Sullivan LA 2007 Reductive transformation of iron and sulfur in schwertmannite rich accumulations associated with acidified coastal lowlands Geochimica et Cosmochimica Acta 71 4456 4473 This article about a specific sulfate mineral is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Schwertmannite amp oldid 1170226260, wikipedia, wiki, book, books, library,
