What crystal is this?
It looks like blue storm agate? but may be blue lace agate?
I would say moss agate but the green looks so light. Aventurine is solid green, and I haven't seen a blue lace agate like this either. Tree agate is usually white with a bit of green isn't it? I have one but not sure on variations. I hope you figure it out, I haven't seen a crystal quite like that and I have lots of them. It could very well be moss agate though.