Coral

Coral can be found in the Ocean biomes at the ends of the world. It grows on Sand Blocks underwater and within 250 tiles of the edges of the map and above the depth of -10 feet / 0 feet  as long as no more than 5 Corals are within a 7-tile range. It can be harvested either with a pickaxe, by mining out the sand underneath it, or by placing a block above it. It can be placed as a decoration and will have one of many appearances, much like Seashells.

Coral will spawn slower on sand under less than 5 tiles of water. Spawn rates scale with Rain, Wind and empty space up to 14 tiles above the sand block.

Coral will only spawn on sand under at least 5 tiles of water. Rain and Wind does not affect spawn rates.

Trivia

 * can be correctly classified as a plant, animal, and mineral at the same time.

History
Corail Coral Коралл 珊瑚