jarosite
noun
ja·ro·site
jəˈrōˌsīt,
ˈjȧrəˌs-
plural -s
: an ocher-yellow or brown mineral KFe3(SO4)2(OH)6 consisting of basic sulfate of potassium and iron and occurring in minute rhombohedral crystals or in masses compare ammoniojarosite, argentojarosite, natrojarosite, plumbojarosite
Word History
Etymology
German jarosit, from Barranco Jaroso, Almería, Spain + German -it -ite