Paleo

I’m making a 14” chisel for stone quarry work made from 7/8 tool steel (according to spark test) with a 7” taper. The first one I made I cut the taper using a band saw and then sanded smooth. I then heated to cherry color quenched the tip and waited until blue moved down and a complete quench in water. The first time I used it an 1-1/2” of the tip snapped off. Where am I going wrong? Thanks