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Understanding defects and influence of dislocations on dicalcium silicates (Ca₂SiO₄) is a challenge in cement science. We report a high-resolution transmission electron microscopy image of edge dislocations in Ca₂SiO₄, followed by developing a deep atomic understanding of the edge dislocation-mediated properties of five Ca₂SiO₄ polymorphs. By decoding the interplay between core dislocation energies, core structures, and nucleation rate of reactivity, we find that γ-C2S and α-C2S polymorphs are the most favorable polymorphs for dislocations in Ca₂SiO₄, mainly due to their large pore channels which take away majority of the distortions imposed by edge dislocations. Furthermore, in the context of edge dislocation, while α-C2S represents the most active polymorph for reactivity and crystal growth, β-C2S represents the most brittle polymorph suitable for grinding. This work is the first report on the atomistic …