You are able to find emeralds in the extreme hills biome (tall mountains and hills). They are very rare though. They are dropped as an item and not an ore. They are pretty easy to find in abandoned mineshafts as long as the mineshaft is in an extreme hill biome. Emeralds are not in veins making them harder to find. They can usually only be found as a single emerald ore. They can be obtained in the ore using a silk touch pickaxe. Emeralds can also be obtained by villagers in NPC villages. You can also trade emeralds to villagers for different items.
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They can be mined. On the Minecraft wiki is says that emerald ore only spawns in extreme hill biomes so find one of them and start digging! See the related link below.
There is no such thing as an emerald pickaxe in Minecraft.
Emerald ore is 129. Emerald block is 133. Emerald stone is 388.
Emerald I think
You need a Iron or Diamond Pickaxe to mine Emerald.