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The equilibrium shape of crystals is a fundamental property of both aestheticappeal and practical import. It is also a visible macro-manifestation of theunderlying atomic-scale forces and chemical makeup, most conspicuous intwo-dimensional (2D) materials of keen current interest. If the crystalsurface/edge energy is known for different directions, its shape can beobtained by geometric Wulff construction, a tenet of crystal physics. However,if symmetry is lacking, the crystal edge energy cannot be defined orcalculated, so its shape becomes elusive, presenting an insurmountable problemfor theory. Here we show how, in fact, one can proceed with "latent edgeenergies" towards constructive prediction of a unique crystal shape, anddemonstrate it for challenging material-examples, like ${\rm SnS}$ of ${\rmC_{2v}}$ symmetry and even ${\rm AgNO_2}$ of ${\rm C_1}$-no symmetry at all.

Defining shapes of 2D-crystals with undefinable edge-energies