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In the context of scales, a barium sulfate (BaSO4) scale is produced in the well and in facilities as the result of precipitation when incompatible waters (one having Ba ion and the other SO4 ion) are mixed or when the equilibrium of the flowing fluid reduced and a precipitate is triggered by over saturation or a physical upset. May also be associated with radioactivity or NORM scale when a radium or uranium isotope is part of the crystalline lattice structure.