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Periodic table

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Copper sulfate is blue in color in its crystalline form and produces beautiful diamond shaped crystals.

The chemical formula of hydrous copper sulfate is CuSO4.5H2O which is often abbreviated to CuSO4 especially when balancing chemical equations.

Hydrous means 'with water'. Each of the pairs of copper sulfate ions in the crystal are surrounded by five water molecules.

Technically, CuSO4 is refers to anhydrous copper sulfate which is produced by heating blue copper sulfate. Anhydrous means "without water'. Anhydrous copper sulfate is gray-white in color and readily changes back to blue color by adding water.