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Copper sulfate (also known as blue vitriol, gall vitriol)
Molecular formula: CuSO₄·5H₂O
Use: Effective activator for sphalerite, stibnite and pyrite.
Properties: Blue tetragonal crystal, easily soluble in water, weakly acidic aqueous solution, slightly soluble in alcohol, insoluble in ethanol.
Quality index: Main content ≥96%.