Values for abundances are difficult to determine with much certainty, so all values should be treated with some caution, especially so for the less common elements. Local concentrations of any element can vary from those given here by orders of magnitude. Notes Potassium metal is far too reactive to be found uncombined in nature. It is mined in Germany, USA, and elsewhere. That as Saskatchewan in Canada contains about 10,000,000,000 tonnes of potassium chloride.
Potassium is found in seawater, but in relatively small amounts compared to sodium.