I believe it is possibly a type of cats eye in low light it throws off a shimmering wavey cats eye. This stone weighs around 5 lbs. Thank you! For your time!
A big marble
Where did you get it from? Can you verify that it is natural?
No, i do not know if it is natural. i have found large spheres that are fiber optics. But this piece has a chatoyant center ring. And the dark outer edges it has lines similar to agate
Can you take a few more pictures with a close-up so we can get a better look?
Thanks for the better pics. Still hard to tell without seeing it in person, though if i had to guess something natural i would guess fluorite. It could still be glass or some other synthetic material though...
It looks like polished Malachite, if so then its worth quite a bit due to its size.