What effects does tiberium have on units?
Green and blue tiberium (the stuff that you can harvest) damages normal infantry units that stand on it. Cyborg units and tiberium creatures get healed by standing on it. Blue tiberium is very explosive, especially when hit by a disruptor beam. Tiberium veins (the orange root-like things) damage all vehicles that stand on it and all buildings that they come in contact with. They’re very dangerous and do a lot of damage.