Pumwater
Pumwater, despite the name, is not a kind of water. Instead, it is actually molten rock. Pumwater Sources can cool into Amalgamation and Flowing Pumwater will form Pumice upon contact with Water.
Obtaining
Pumwater can be found underground in small amounts. If you manage to come across 5 Pumwater sources you can Renew it.
Usages
Pumwater can be made into Lux Cobble.