End portal

Black Stuff is a block that was added in the 1.9 prerelease 3. It has a very strange appearance, which can be best described as a portal view on a virtual black floor with blue star-like particles on it. It also emits light and black smoke. Only the top and the bottom sides of the block are visible, the bottom side looks like stone.

It's purpose is currently unknown. Although, players theorize that it may be crying obsidian or will be used for portals.

The game will crash when you move the cursor above the block in the inventory.