No, you can call them an organism.
coral reefs are formed from mineral.
Obviously Black Coral.
It is a living plant
animal
they are truly animals.
a rock? i guess
calcium carbonate
Hawaii does not have a state mineral, but it's state gem is black coral.
A Reefer.
Atoll
A reef .
Yes. With the exceptions of coral and pearl, all gemstones are minerals.