... is a colorless crystalline, water-soluble. The hydrated form, ZnSO4·7H2O, the mineral , was historically known as "white vitriol ... Monohydrate; Zinc Vitriol Monohydrate; White Vitriol, Monohydrate. Formula: ZnSO4 H2O Molecular Weight: 179.445 Properties: White free flowing powder ... supply zinc in animal feeds, fertilizers, and agricultural sprays. ZnSO4·7H2O is used in making , in coagulation baths for ...