The author of the Enderite mod thought that there are too few types of ore in vanilla Minecraft for Android, from which armor, weapons and tools are crafted. No wonder, in Minecraft PE it is really not enough. However, using a mod called Enderite, you will get a dozen more items.
Enteritis ore will spawn in the edge of the MinecraftBedrock Edition. Well, or it won’t spawn there. It depends on which folder in the archive you choose. Just keep in mind that ore generation can cause bugs in Minecraft Pocket Edition. And don’t forget to enable the game’s experimental features.