The lighting ball ore is a ore that if found from layers 4-10, in veins of 2-8. It is about as common as gold ore, and looks to have a pale yellow. It drops the Lighting shard, which is used to craft the Electolysed Dragon Saddle, for riding electric dragons.
The ore itself can only be mined with silk touch. If done so, the Lightning Balls can be placed on the ground and will heal all Electric Dragons nearby (Similar to a Ender Crystal, but basically indestructable without a pickaxe)