Vickers hardness (H V ) was predicted using three contemporary theoretical models of hardness . The thermodynamic model is based on thermodynamic properties and crystal structure, Lyakhov-Oganov approach considers topology of the crystal structure, strength of covalent bonding, degree of ionicity and directionality, while Mazhnik-Oganov model is based on elastic properties. The fracture toughness (K Ic ) was evaluated using Mazhnik-Oganov model.