That would be pretty powerful if not connected to the stone and would have likely left a crater which I don't see.If that was tannerite, it was a lot of it. Looks like a good bit of the bottom section was shattered like blasting rock. Assuming it was just up against the stone and not confined and still did that, wow!
Wouldn't take much to drill into the stones you can insert some boom material. That would explain the fracturing to some degree.