Zinc sulphate heptahydratum compositum est inorganicum cum formula hypothetica ZnSO4 7H2O, vulgo alumen et zinci alumen.Spodium prismaticum hyalinum orthorhombicum crystallum zincum sulphatum crystallinum zincum sulphatum granularem, pulveris crystallini albi, in aqua solubilis, leviter solubilis in ethanol.Aquam calefactam ad CC°C amittit et ad 770°C putrescit.