When lava and water mix it tures into obcidion not stone!!! So I think that obcidion should be added to the solids. Oh yes and also I think that it should have health (Because it turns to sand when it brackes)
I agree but not with your language and title. Obsidian should be early in game not that late but it's good idea to put Obsidian. Also, When obsidian breaks it should break into stone.