Sideronatrite and metasideronatrite efflorescence formed in a coastal sea-spray environment

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Sideronatrite [Na2Fe(SO4)2(OH)·3H2O] occurs as yellow botryoidal encrustations on low cliffs of weathered pyrite-bearing mudstones at Barton-on-Sea, Hampshire, England. Extensive areas of the cliffs, up to ~100 m2, are coated with sideronatrite and its low solubility in cold water secures its longevity. Dry samples of sideronatrite convert readily to metasideronatrite [Na2Fe(SO4)2(OH)·H2O], the reaction to sideronatrite being reversible. Sideronatrite, it is suggested, forms as a result of weathering of pyrite that is present in the argillaceous sediments and reaction with Na from the sea-salt spray.

Original languageEnglish (US)
Pages (from-to)757-759
Number of pages3
JournalMineralogical Magazine
Issue number5
StatePublished - Oct 1999


  • Efflorescence
  • Metasideronatrite
  • Pyrite
  • Sideronatrite
  • Weathering

ASJC Scopus subject areas

  • Geochemistry and Petrology


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