Both caffeinated and herbal teas might give extremely small amounts of minerals such as potassium, phosphorous, magnesium, sodium, copper and zinc. The real quantity varies depending upon the age and expanding problems of the tea plant. For example, there are just about 5 milligrams of calcium in one cup of herbal tea, such as chamomile. Tea is also a resource of fluoride, however the quantity can differ depending on the kind and also the amount of water that is used to make it.