Duplication glitch allowaws player to duplicate any block of their chioce.
1) in survival, choose block you wish to duplicate
2) place block
3) quickly hit the 'home' button
4) Double tap home button, and delete Minecraft PE from running apps.
5) Reopen Minecraft PE, and select your world.
6) the block you placed SHOULD be in both your inventory AND where you placed it.
Duplicate of MCPE-396 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.