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We present a novel method to predict the fracture surface energy, {\gamma},of isochemically crystallizing silicate glasses using readily availablecrystallographic structure data of their crystalline counterpart and tableddiatomic chemical bond energies, D0. The method assumes that {\gamma} equalsthe fracture surface energy of the most likely cleavage plane of the crystal.Calculated values were in excellent agreement with those calculated from glassdensity, network connectivity and D0 data in earlier work. This findingdemonstrates a remarkable equivalence between crystal cleavage planes and glassfracture surfaces.

Glass fracture surface energy calculated from crystal structure and bond-energy data