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[jar-uh-sahyt, juh-roh-sahyt] /ˈdʒær əˌsaɪt, dʒəˈroʊ saɪt/
a yellowish or brownish mineral, a hydrous sulfate of potassium and iron, KFe 3 (SO 4) 2 (OH) 6 , occurring in small crystals or large masses.
Origin of jarosite
1850-55; named after Barranco Jaroso (in Almería, Spain); see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for jarosite
  • They have also discovered jarosite, a sulfate that contains water and forms under acidic conditions.
  • The mineral that people are getting particularly excited about is called jarosite.
  • When the oceans dried up this sulfur rich water formed the jarosite.
  • jarosite was discharged directly from the end of the tailings pipeline.
  • The light-colored mica schist is soft and commonly contains jarosite and a greenish mica.
  • Abundant jarosite in the western center marks the location of oxidized pyrite from an initial stage of mineralization.
  • The jarosite-rich samples and many of the mixed alunite-jarosite samples probably are supergene.
British Dictionary definitions for jarosite


a yellow to brown secondary mineral consisting of basic hydrated sulphate of iron and potassium in masses or hexagonal crystals. Formula: KFe3(SO4)2(OH)6
Word Origin
C19: from Barranco Jaroso, in Almeria, Spain + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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