I believe this to be a Montana Agate I got in a bulk sale at the last rock and gem show I attended. This stone is from a larger piece I broke apart and then tumble polished. I love the amber colour it is so rich and the sunlight shines through it giving showing orange and yellow shades. I can be worn or used as a suncatcher in the window. You can purchase it either way, just let me know if you want the hanger.