The Probert Encyclopaedia of Science & Technology

CALCIUM

Calcium is a lustrous silver-white brittle alkaline metal element with the symbol Ca. Its oxide occurs widely in nature as lime. It is a member of the alkaline earth group of elements.
Calcium occurs widely in nature, as in its compounds calcium carbonate or limestone,
calcium sulphate or gypsum, calcium fluoride (fluorspar), and calcium phosphate (apatite).
Research Calcium