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The Collaborative International Dictionary
Jarosite

Jarosite \Ja*ro"site\, n. [From Barranco Jaroso, in Spain.] (Min.) An ocher-yellow mineral occurring in minute rhombohedral crystals. It is a hydrous sulphate of iron and potash.

Wiktionary
jarosite

n. (context mineralogy English) A mineral with rhombohedral crystals, potassiumiron33+(sulfuroxygen4)2(Ohydrogen)6.

Wikipedia
Jarosite

Jarosite is a basic hydrous sulfate of potassium and iron with a chemical formula of KFe(OH)(SO). This sulfate mineral is formed in ore deposits by the oxidation of iron sulfides. Jarosite is often produced as a byproduct during the purification and refining of zinc and is also commonly associated with acid mine drainage and acid sulfate soil environments.