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.
Coral Fossils. Corals (Phylum Cnidaria, formerly called Coelenterata) are solitary or colonial, filter-feeding and predatory animals that build a skeleton of calcium carbonate. The cnidaria also includes such soft-bodied forms such as jellyfish. Corals range from Ordovician to Recent and are prominent fossils in Ordovician through Devonian rocks in Ohio.