Tannerite is, though. (And where it isn't, blasting charges for mining are. And where those aren't, fertilizer probably still is. Explosives are hard, yet also far easier than you'd think)
You'll find that regular fertilizer has explosion retardant additives. Which made me think (and was confirmed later) that the Beirut explosion was 'weapons grade' ammonium nitrate, rather than the stuff sold to civilians.