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The relaxed interfaces of the 100, 1 01, 001, 20 1 and 101 contact twins of the gypsum crystal are theoretically examined and their perturbed structure is described. The obtained twin energies ( PT  ) are: 13.6, 145, 255, 826 and 848 erg cm for the 100, 001, 1 01, 20 1 and 101 laws, respectively. Hence, the five twin laws can be divided in three classes reflecting the deep difference due to the character of the face, in the sense of Hartman-Perdok, on which the contact twin is supposed to form. In fact, the Original Composition Planes of the 100, 001 and 1 01 laws correspond to stepped (S) faces, while those of the 20 1 and 101 laws correspond to kinked (K) faces. Furthermore, the highest probability of occurrence of the 100 contact twins is strictly related not only to the lowest PT  value, but also to the fact that, among the three S faces, (100) is the only one belonging to the athermal equilibrium shape of the crystal.

The Five Twin Laws of Gypsum (CaSO4·2H2O): A Theoretical Comparison of the Interfaces of the Contact Twins

The Five Twin Laws of Gypsum (CaSO₄·2H₂O): A Theoretical Comparison of the Interfaces of the Contact Twins