Abstract: An electro-conductive ceramic comprising a non-electroconductive matrix ceramic, an electro-conductive ceramic in relatively large proportion to permit efficient electro-discharge machining (EDM) of the ceramic and ceramic whiskers of low aspect ratio and short length dispersed in the ceramic body to provide high fracture toughness, stength and hardness despite the relatively large proportion of electro-conductive ceramic. Complex geometries and features such as holes, chamfers, slots, angles, changing radii an complex curves can be electro-discharge machined into the ceramic body after hot processing or hot-isostatic pressing to achieve maximum density and mechanical properties. A particularly advantageous high temperature extrusion die, powder metal compacting die hardware and cutting tools formed of Al.sub.2 O.sub.3, TiC and SiC whiskers have been produced and tested.