CuSO4, or copper(II) sulfate, is a blue crystalline solid commonly used in various applications. It consists of one copper atom, one sulfur atom, and four oxygen atoms. This compound is often found in nature as the mineral chalcanthite and is soluble in water, making it useful in agriculture as a fungicide and herbicide. In addition to its agricultural uses, CuSO4 is employed in laboratories and industries for processes like electroplating and as a chemical reagent. It can also be used in the production of pigments and in the treatment of water to control algae growth.