I wanted some coral to decorate the aquarium I built, and some coral fans to stick on the coral blocks I brought back. According to the wiki, coral can be mined with any tool and always drops itself. But every time I try to collect it, it just breaks no matter what I use and doesn't drop anything. The only pieces I've managed to get were from breaking the block under them and them detaching instead of vanishing. This is in survival, in my pure survival achievement world.