Diamondillium

Diamondium is a blue and ultra hard mineral created by Dr. Ogden Wernstrom. It was used to defend Earth from the tentacles of Yivo, but failed. There was a contest of Deathball between Professor Hubert J. Farnsworth and Wernstrom to decide wether Diamondium or Diamondillium would be used to do it. Farnsworth lost, so Diamondillium was used.