Volcanic Lightning

So we all know that lightning happens in big storms, and Ms. Meyer told us of lightning during volcanic eruptions. I actually didn't think that the lightning during these eruptions was coming from the eruption itself. I thought there just happened to be a storm or something.

As depicted in this photograph, you can clearly see a giant plume of ash rising far above what appear to be clouds. Under those clouds is legit lightning mixing in with the fire/lava. I won't go into great detail about the physics behind lightning, but it is still one of the least known phenomenon, mind you that is regular lightning. Volcanic is on a whole different level. Anyways, lightning is formed when particles break down or collide. The positive and negative charges separate onto opposite ends creating the electric flow. When the said flow becomes to great for the air to handle you actually can see the electricity, lightning.

This is my favorite picture:
http://geology.com/articles/volcanic-lightning/