The Cobble Popper will generate cobblestone when adjacent to Lava and Water source blocks.
The cobblestone will be popped into the air if not extracted with a hopper or pipe.
A Redstone signal will disable the Cobble Popper
The rate of cobblestone generation and the velocity of the popping are configurable.
The default rate of production is 1 cobblestone/sec per lava-water pair.
This mod was ported to 1.8.9 from one of my 1.7.10 mods: Feed the Creeper Tweaks
Feel free to use in modpacks; notification is appreciated, but not required.
Demo (with more fun config settings):