Vitriol is the general chemical name encompassing a class of chemical compounds comprising sulfates of certain metals originally iron and copper.
These mineral compounds were distinguished by their colors such as green vitriol, white vitriol, and blue vitriol.
Zinc sulfate () is one such sulfate and is of white color, hence it is called White vitriol.
These materials were originally found as crystals formed by evaporation of groundwater that percolated through sulfide minerals and collected in pools on the floor of gold mines.
Therefore, The chemical formula of white vitriol is Zinc Sulfate.