The technical feasibility for producing five different anorthite-based binary and ternary hybrid ceramics containing zirconia and/or silicon carbide whiskers and/or gel-derived in situ formed mullite whiskers was examined. The crystallization behaviour of the anorthite and the mullite gels and the phase stability of the hybrid ceramics were studied by X-ray diffractometry. The densification behaviour of the gel-derived materials, including the binary and the ternary composition materials, was examined by measuring densities of the sintered specimens by the immersion method. The microstructures were studied by scanning electron microscopy, supplemented by energy dispersive X-ray spectrometry. The results show the technical feasibility for producing anorthite-based fully dense binary and ternary hybrid ceramics of stable compositions containing zirconia and/or silicon carbide whiskers. However, the compositions containing mullite as a constituent produced hybrid ceramics with in situ formed rod-like corundum crystals as the dispersed phase. Discrete monoclinic zirconia was present in all compositions containing this material.