hafnon is the natural form of hafnium orthosilicate. its name suggests the mineral is the hf analogue of much more common zircon. hafnon is the only currently known confirmed mineral of hafnium (i.e., hafnium-dominant one). hafnon and zircon form a solid solution. hafnon is a solely pegmatitic mineral and it occurs in largely fractionated (complex-genesis/history) pegmatites.