The mercury salt of fulminic acid (Hg(CNO)2), called additionally fulminate of mercury. It's an explosive mixture ready as grey crystals, and it is used mostly in detonators for detonating high explosives, particularly dynamite or TNT. It is sensitive to shock that can be detonated by a blow.
a fulminate whenever dry explodes violently if struck or heated; used in detonators and blasting limits and percussion hats
How would you define mercury fulminate?