Dust explosions using a fern "pollen", lycopodium powder, are a classic chemistry class demonstration. If you haven't done the lycopodium demonstration, then you probably not a chemistry teacher. Here in Beals Science you'll see an over the top demonstration.
The fine spores come from the lycopodium clubmoss.
How they do the demonstration in Germany!
A series of industrial tests to show the flammability of different substances in dust form.
Myth-busters used dairy creamer to make a huge dust explosion.
On a more serious note:
A video from the US Chemical Safety Board
