Netherrack XRay

This x-ray texture pack will be relevant only for the Nether Update owners since it was explicitly designed to find Netheritre. This scarce material can be located on the lower levels of the Underground World.

If you want to craft anything out of it, you’ll have to spend ages there. Xray is supposed to help you with that in Minecraft PE.

Nonetheless, do not use it on servers, whereas its usage might severely affect other players’ experience.