What is the common name for the chemical compound copper sulphate?

Copper sulphate is commonly known as "Blue Stone" primarily due to its vibrant blue crystalline appearance. This blue color is a distinctive feature of the pentahydrate form of copper sulphate, which is often used in various applications, including agriculture as a fungicide and in chemistry as a laboratory reagent.

The term "Blue Stone" originates from the visual properties of the compound, making it easily recognizable and often referred to in that manner within both scientific and general contexts. Understanding this connection between the compound's chemical structure and its common name can help in recognizing its uses and significance across different fields.