Letter Grade 4.0 Point Scale (+/-) A+: 4.0: A: 4.0: A-3.7: B+: 3.3: B: 3.0: B-2.7: C+: 2.3: C: 2.0: C-1.7: D+: 1.3: D: 1.0: D-0.7: F: 0.0
Coral calcium is a salt of calcium derived from fossilized coral reefs (primarily from limestone and coastal deposits).It has been promoted as an alternative, but unsubstantiated, treatment or cure for a number of health conditions.oral calcium is a source of calcium, which is an essential mineral for human life. Coral has a chemical structure that is very similar to the composition of human bone and is sometimes used as material in bone grafts.
Photo Credit Digital Vision./Photodisc/Getty Images. Calcium from coral is primarily calcium carbonate, which is used as a dietary calcium supplement. Coral calcium is mined from the coral beds along the coastline and is then typically ground into a fine powder and heated.hoto Credit Digital Vision./Photodisc/Getty Images. Calcium from coral is primarily calcium carbonate, which is used as a dietary calcium supplement. Coral calcium is mined from the coral beds along the coastline and is then typically ground into a fine powder and heated.