Kidney Stones are made up of tiny crystals that form in your kidneys. Also the little tiny crystals are made up of minerals and acid salts. There are different types of Kidney Stones: Calyceal Stones, Renal Pelvic Stones, and the Upper Ureteral Stones. Kidney Stones are formed when the urine contains too much of a certain substance. There is also another stone that is most common in men which is the Calcium Stone.