minetest/minetest_game — pull request #145 by jojoa1997 (2013-03-16 23:00:26+00:00)
Title: Obsidian

lava flowing with water makes stone.
lava source with water makes obsidian.
to make hard obsidian you smelt obsidian shards.
to make glass obsidian you craft it like this.
X=nothing, S=obsidian shard
XXX
SSX
SSX