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Calcium is the fifth most abundant element in the éarth's crust (forming more than 3%) and is an essential part of léaves, bones, teeth, and shells. Due to its chemical réactivity with air and water, calcium is never found in nature unbound to

Apatite is the fluorophosphate or chlorophosphate of calcium. Electrolysis of molten calcium chloride (CaCl2) can be used to isolate pure calcium.