Calcium was discovered in 1808 by Sir Humphrey Davey. It was not until 1898 that it was obtained in a pure form by Moissan. While it does not occur as a metal in nature, it is present as calcium compounds over a large part of the earth's crust. The three most common forms are marble, limestone and chalk. All three of these are chemically calcium carbonate. Dolomite is the double carbonate of calcium and magnesium. Gypsum is hydrated calcium sulphate; calcium phosphate and calcium fluoride. Igneous rocks contain a lot of calcium.
Calcium is an essential component of fertilizers. Also animals require calcium and phosphorus for bone and teeth growth. If there is a deficiency it can be treated by administering calcium phosphate.
Calcium is a similar compound chemically to strontium. This is why any fall-out from the radioactive strontium 90 is so dangerous to animals as it is quickly and efficiently taken up by their bodies.
Calcium is an essential component of fertilizers. Also animals require calcium and phosphorus for bone and teeth growth. If there is a deficiency it can be treated by administering calcium phosphate.
Calcium is a similar compound chemically to strontium. This is why any fall-out from the radioactive strontium 90 is so dangerous to animals as it is quickly and efficiently taken up by their bodies.