End Portal Frame

End Portal Frame is a block that can be found in Strongholds. It resembles an End Stone with a decorative bluish-green top, with sides decorated in hollow rounded rectangles with the same color as the top. They are found in a 12 block ring shape within a room over a pool of lava and a staircase containing a Silverfish spawner. They are one of few blocks that are not available in the creative mode inventory, but can be obtained with the 'pick block' feature.

Uses
Some of the blocks have an Eye of Ender inserted into it. Using other Eyes of Ender on the rest of the blocks inserts them to the top of the blocks. Once an Eye of Ender has been inserted in all 12 Frame blocks, then the Ender Portal will activate and the player can pass through to access The End. Additionally, like Bedrock, the frame blocks are only destructible in Creative Mode; they may not be mined or broken with tools or explosions.

History
Prior to Beta 1.9 Pre-release 4, End Portal Frames used to have a different texture, emitted a blue shaded light at level 15, and was non-solid block when cracked, becoming solid when repaired. Although it could not be mined, an explosion caused it to drop itself. They had no tooltip, indicating that them dropping at all was a bug. The player had to repair a cracked End Portal Frame by right clicking it with an Eye of Ender.

Trivia

 * Unlike Nether Portals, breaking an End Portal Frame will not disable the portal itself.
 * Like Bedrock, End Portal Frames are indestructible without the use of Creative mode or mods.
 * If placed by using mods or commands to obtain it and then being placed over ice you will slide on the End Portal Frame blocks.