If you do know what this is, we'd love to hear from you. This is an unknown type of Plume Agate that came from an old stock collection, and was mixed in with a crate of Montana Agates. I am unsure of where this has come from, and upon talking with other rockhounds, a few suggestions such as Marfa Plume or Iranian Plume have been made; with no definite answer. One thing is certain, this Blue and White Plume with a black background is very unique and captivating. This is a really awesome and rare collectors specimen that would have room for multiple cabbing slabs if one desired to do so. It also has a nice botryoidal top. Photos are generally taken wet to simulate what a polish would look like.