Chalcantite wani ma'adinai ne wanda yake shi ne hydrated jan karfe sulfate. Tsarin sinadaransa shine CuSO4 · 5H2O. Sunan "chalcantite" ya fito daga kalmar Helenanci "chalkos," wanda ke nufin jan karfe. Chalcantite launi ne mai shuɗi-kore kuma ana samunsa a cikin yanki mai oxidized na ajiyar tagulla. Lu'ulu'unsa yawanci ƙanana ne kuma suna da ƙima, kuma yana da haske mai ɗanɗano. Wani lokaci ana amfani da Chalcantite azaman tushen jan ƙarfe don pigments da sauran aikace-aikace.