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Mineral functions and sources. Calcium:  needed for healthy bones and teeth, normal blood clotting, and nervous system functioning.  sources: dairy products, broccoli, cabbage, kale, tofu, sardines and salmon.
There is more calcium in the body than any other mineral, and it has several important functions. These include: 1  helping to build strong bones and teeth. 2  regulating muscle contractions, including heartbeat.3  ensuring that blood clots normally.ood sources of calcium include: 1  milk, cheese and other dairy foods. 2  green leafy vegetables â such as broccoli, cabbage and okra, but not spinach. 3  soya beans.