system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How to "snap pops" (the little paper fireworks that go off when you throw them on the ground) work?

There seem to be little rocks (quartz?) in there, what part do they play?
gpt
They use a very small amount of a very volatile explosive called silver fulminate.  It takes little in the way or heat or pressure to get the explosive to go off.  In the case of snap pops, they also mix in gravel, that causes enough impact or friction power when thrown to cause the silver fulminate to explode.