Coral Fan

Coral fans are a "block" that were added in update 1.4. It comes in many variants and generates in Coral reefs.

variants
Blue = Tube Coral Fan

Pink =  Brain Coral Fan

Magenta = Bubble Coral Fan

Red = Fire Coral Fan

Yellow = Horn Coral Fan

trivia

 * There are dead Coral versions as well, but all seem to have different textures.