Biochemical Rocks
Coral is an actual living organism, while rocks are made out of other organic or inorganic materials.
calcium
Coral is a living organism, and harvesting coral for jewelry is not environmentally responsible.
The reef sits on top of thousands of years of compacted coral skeletons that have compressed and fused to form limestone rocks. So yes, there are rocks in the reef as it is principally composed of rock.
Deposits of Coral Rocks
Deposits of Coral Rocks
They would only be organic if the particles or fragments are from a once living organism - sea shells, coral, etc.
Generally speaking, live coral.
No, you can call them an organism.
neither it is an organism
No coral is NOT sediment. Coral SAND is a sediment but the coral itself is a living organism - if buried and lithified, the coral becomes a fossil.
zooxanthellae in coral.