Obsidian is a deep purple and black block. In the Overworld, Obsidian never actually spawns with the chunk, but is created by the environment. Obsidian is formed when flowing water hits a lava source block, and can be found naturally where water from a spring or lake has flowed over a nearby lava pool. In The End, solid pillars of obsidian can be found on the surface as well as in the obsidian platform. (It is one of the few blocks not destroyed by contact with the Enderdragon, along with End Stone and Bedrock.) In the Nether, obsidian does not form naturally, but is created when a Nether Portal is spawned.