An amorphous glass was obtained by melting drill cuttings from oil and gas exploration and production operations in the North Sea that have been blended with sodium and calcium oxides to minimise the melting temperature. Mixtures containing dried drill cuttings:sodium oxide:calcium oxide in the weight ratio 8:1:1 held at 1300 A degrees C for 5 h produce an amorphous solid that can be further treated at temperatures between 750 and 800 A degrees C to give a largely crystalline glass-ceramic. The glass-ceramics have been characterised by physical, chemical and mechanical analyses and shown to have properties of machinability, strength, wear-abrasiveness, thermal resistance, resistance to crack propagation, and stability towards leaching that make the materials suitable for tiling applications, allowing diversion of the drill cutting wastes from final disposal in landfill.