Zinc-melanterite
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Zinc-melanterite is a mineral, a sulfate of zinc, copper and iron with formula (Zn,Cu,Fe)SO4·7H2O. It is a soft monoclinic yellow green mineral with Mohs hardness of 2 and a specific gravity of 2.02.
It was discovered in 1920 in the Vulcan mining district of Gunnison County, Colorado, United States, and is named for its zinc content and its resemblance to melanterite
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