An ocher-yellow mineral occurring in minute rhombohedral crystals. It is a hydrous sulphate of iron and potash.

an ocher-yellow to brown hydrated potassium iron sulfate mineral utilized for radioactive dating.

iron sulphate (classified as a hazardous waste).

a hydrous sulfate of iron and potassium, occurring in yellowish or brownish rhombohedral crystals. [AHDOS

Jarosite is a basic hydrous sulfate of potassium and iron with a chemical formula of KFe3+3(OH)6(SO4)2. This 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.