This is really a neat Impact marble! It has a large chunk of encased volcanic rock, perfectly inserted in the middle of this marble, and the impact area shows a fumed web that seems to have erupted from around the impact area. The fuming is very shiny and mirror-like as you can see from the second pic. When you turn the marble over, you are greeted with another beautiful surprise, a nice gold fumed implosion. There is some sparkly aventurine type glass around the equator, and there is a slight wrinkle in the glass in one spot. Super fun impact marble!!