Yeah, emeralds aren't supposed to spawn in any biome except ExtremeHills, or mountains.
I voted emerald because villagers are always sharking me with trades. I would like emerald tools but armor has to be traded with villagers withe the same amount, like trade a blacksmith (black apron) villager 8 emeralds for an emerald chestplate.\
EDIT: I forgot to say that I WOULD have voted for bedrock, like an insanely long time to mine it, then a small chance to get a bedrock particle, then 9 of those are a bedrock pebble, then 9 of those are a bedrock piece, then 9 of those are a bedrock stone, then 9 are a bedrock chunk, then 9 are a bedrock rock(for lack of a better word for something larger than a stone), then 9 are a bedrock 54th, then a 36th, and so on until a bedrock 9th then bedrock. Yeah. And 2 bedrock is a bedrock ingot that makes bedrock armor and weapons.
Hey, for unbreakable tools, weapons, and armor, they gotta be costly!
