Which mineral group is the main natural source of phosphorus?

The main natural source of phosphorus is the apatite series of minerals. While more than 550 different minerals contain phosphorus, the apatite group—specifically fluorapatite—serves as the world's major source of the element.12

Commercially, the chief source is phosphorite, also known as phosphate rock, which is an impure, massive form of carbonate-bearing apatite. These deposits are widely distributed and are primarily utilized in the production of fertilizers and animal food supplements.13