The quantity of sewage sludge generated daily by wastewater treatment plants represents a major environmental problem and a financial burden for plant operators.Valorization strategies focusing on reusing sewage sludge as a raw material are currently developed. Vitrification can help us reduce the volume of waste and binds the components in the structure of chemically stable glasses and glass-ceramics. In this study, the vitrification of sewage sludge inside a basaltic rock has been simulated by producing glasses and a glass-ceramic from basalt enriched in calcium that lie between the stability fields of pyroxene and melilite in the system CaO-MgO-SiO 2 -Al 2 O 3 . CaO addition causes the oxidation of the melt at above the liquidus, increases the crystallization temperature, decreases the melting temperature, and improves the microhardness of the glasses. Glass-ceramic processes improves the properties of the Ca-doped basalt glass. The microhardness of the glass (8.2 GPa) and the glassceramic (8.6 GPa) and leaching tests (in the ppb range) place both the glass and the glass-ceramics at the high end of the mechanical properties and chemical resistance of ceramic tiles for the building industry.