The effect of spodumene particle-size on the sintering of spodumene-borosilicate glass composites was investigated. The results can be explained by a particle-size dependence of the extent of reaction between spodumene and glass. For samples fabricated with fine spodumene particles (1.5-3 mu m), a reactive liquid-phase sintering behaviour was observed. Smaller particle size resulted in a higher sintered density and coarser microstructure. For samples fabricated with coarse spodumene particles (3-7 mu m), a non-reactive liquid-phase sintering behaviour was observed when a high-viscosity glass, a lower initial glass content, and a lower sintering temperature were used. A larger particle size resulted in a higher sintered density and coarser microstructure. If a low sintering temperature or a coarse (e.g., 7 mu m) particle size were used, the dissolution of the glass into spodumene was reduced which resulted in an increased amount of glass crystallization.