Emerald Ore

Emerald ore is a rare mineral block that generates only in mountains and windswept hills biomes. It drops emeralds when mined, or itself if mined with a pickaxe with the Silk Touch enchantment.

Deepslate emerald ore is a variant of emerald ore that can generate in deepslate and tuff blobs.

Breaking
Emerald ore can be mined with a pickaxe made from iron or better, otherwise it drops nothing. If mined without Silk Touch, the block drops 1 emerald (or up to 4 with Fortune). It also drops when broken.

Natural generation
Emerald ore generates in mountains and windswept hills biomes in the form of ore features, from levels -16 to 320, being most common at level 256, and becoming less common toward either end of the range. It can replace stone, andesite, granite, diorite, tuff and deepslate.

$$, emerald ore attempts to generate 50 times per chunk in blobs of 1. Emerald ore can be exposed to the sky, which is intended.

$$, emerald ore attempts to generate 100 times per chunk in blobs of 0-3 ores.

Emerald ore that replaces tuff or deepslate becomes deepslate emerald ore, which is the rarest ore in Minecraft, rarer than normal emerald ore and ancient debris. It only generates between the altitudes of -16 and 8 where deepslate naturally occurs, which happens to be towards the end of emerald ore distribution where it is extremely rare; its limitation to certain biomes further adds to its rarity.

Note blocks
Emerald ore can be placed under note blocks to produce "bass drum" sounds.

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Trivia

 * Even though emerald ore is rarer than diamond ore, emerald ore is generally found more often in mountains biomes than diamond ore, as the emerald ore blocks are generated in a more scattered fashion.