Get stone from lava. Identical to the 'molten copper from lava' recipe except there's no molten copper output, just stone.
Small changes concerning balance, gameplay, or graphics.
Furnaces, assembling machines, production chains.
Perhaps output some random ore so you still have a byproduct? Some iron/copper ores, or perhaps even some coal, somehow coal is in the vulcanus lava, i mean the planet has quite some of it.?
