Move rocks from 853.11, 266,50, -22.07 (be careful of Skith'Kath the Harrowing Scourge) and fly them over to 698.80, 368.62, 97.87 and put them inside the crack in the ground. Wait about 3-5 seconds and you can once again pick it up, thus giving you the leeched graymanite that you need. Wash, rinse, repeat six times.