In my game, I have 2 volcanoes, so I've built steam turbine above. But I notice something strange.
Even with a full tile of magma, when it cool down below the freezing temperature, it turns into packs of igenous rock, instead of making a solid tile. O_o
As you can see, there's more than the amount needed to make a tile. And the first pack on the left has 10 tons cumulated : the tile produce a pack, magma fill the tile, it produce a pack, etc ... 10 tons !
As far I see, the magma produce a tile only if there's something above.
it can even produce weird behavior, like this other volcano.
In this room, the magma flow in 2 layers. As mentionned above, the first layer turns into solid tile, and the second was, at first, packs. It turns in a solid tile with burried object on reloading. And a second reloading gives another solid tile above.
Steps to Reproduce
cool down a tile of magma
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.