It’s fireworks time! Skylighter.com has a recipe for a more powerful version of those balls that bang when you knock them together. You paint smooth rocks with a mixture that contains powdered glass, potassium chlorate, and sulfur (all disclaimers in place). Then let dry. Drop or throw the rocks, and they’ll “bounce” repeatedly with a loud explosion each time.
Link (scroll down to middle of page).
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You know, one of the really compelling reasons for getting a house and yard would be to be able to do projects like this.
wow, I never thought it would be make magazine telling me how to make crack rocks.
I tried this and they work. Th rounder the rock, the better. Also throw it hard onto the ground. The arder, the better.