Minecraft wiki entry for Emerald_Ore, associated text: Emerald ore can generate in Overworld in the form of blobs. Emerald ore attempts to generate 50 times per chunk in blobs of 1, from levels -16 to 320, being most common at level 256, and becoming less common toward either end of the range. Emerald ore can be exposed to the sky, which is intended.[1] In Bedrock Edition, emerald ore attempts to generate 100 times per chunk in all types of windswept hills or mountains biomes in blobs of 0-3 ores, from levels -16 to 320, being most common at level 256, and becoming less common toward either end of the range. Emerald ore can replace stone, andesite, granite, diorite, and deepslate. Emerald ore that replaces deepslate will become deepslate emerald ore.