Ender Portal Frame

The Air Portal Frame was added to 1.9 Prerelease 3. It has a luminance of 15 and can be placed underwater just like Glowstone (Block). It is a solid block when repaired, but non-solid when cracked.

The blocks cannot be mined, similarly to bedrock. However if an explosion occurs nearby, an item appearing similar to Glass Panes will drop, allowing it to be picked up and placed. It is unknown if this is intentional, although it is probably just a bug. When seen in the inventory, it has no mouse-over name.

The cracked frames can be repaired by right-clicking the block with an Eye of Ender.