[jar-uh-sahyt, juh-roh-sahyt]
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.

1850–55; named after Barranco Jaroso (in Almería, Spain); see -ite1

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World English Dictionary
jarosite (ˈdʒærəˌsaɪt)
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
[C19: from Barranco Jaroso, in Almeria, Spain + -ite1]

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Example sentences
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
When the oceans dried up this sulfur rich water formed the jarosite.
Jarosite was discharged directly from the end of the tailings pipeline.
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