Previous studies of sintered glass and glass-ceramic matrix composites from silicatewastes have concentrated on the use of commercially available and relatively costly reinforcements, such as Al2O3 platelets [1,2], and SiC, TiC [3,4] or metallic particles [5]. The influence of the reinforcement addition on the microstructure and mechanical properties of waste derived glass-ceramics has been investigated and usually a better mechanical behaviour with increasing volume fraction of reinforcement addition has been achieved [1–5]. It is interesting therefore to investigate other kinds of reinforcing components, coming from less expensive sources, for production of waste derived