Emerald Ore is a very rare ore in Minecraft due to its single-biome and single-vein spawning mechanics. It drops 1 Emerald when mined with an Iron Pickaxe or higher (1-4 if the Fortune enchantment is used). Emerald Ore only occurs in Extreme Hills biomes. This is one way to obtain Emeralds; the other, easier, way is to trade with Villagers, as mining is not very productive in all but the largest caverns. Unlike most ores, Emerald Ore almost always appears in veins of one block.