A novel glass-ceramic material was developed from the melt of a TiO2-containing iron-making slag with additional waste glass. The high percentage (similar to 20 wt% TiO2) of this network-modifying oxide has promoted a crystallization of the parent glass, resulting in a fine-grained, homogeneous polycrystalline material with high mechanical properties (E=120 GPa, flexural strength=similar to 180 MPa, and Vickers hardness=7 GPa) after a heat treatment at 1100 degrees C for 2 h. The room temperature and elevated temperature fracture toughness were also studied. The main crystalline phases of the glass-ceramic material were of the pyroxene series until heat-treatment temperature reached 1000 degrees C, at which titanium-rich perovskite and armalcolite crystals became the dominant phases. The end material is high-strength, aesthetically acceptable (metallic gray or opaque brown colored), and suitable for structural and architectural applications.