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Melanterite

Melanterite is a water soluble sulfate mineral.

Chemical Formula: H₁₄FeO₁₁S

Other names: Iron sulfate heptahydrate

Layman's explanation: Melanterite usually found in iron sulfides such as pyrite, pyrrhotite, marcasite and chalcopyrite, which are found in many mines all over the world including Spain, Germany, Sweden, and the United States. Melanterite is only one of the few water-soluble sulfate minerals. Some uses of melanterite are in the manufacturing of ink, in wool dying as a mordant, and also in water purification.

Keywords: mordant, water purification

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