Unique Quartz Specimen (B12) For Sale

This is an unusual Quartz specimen. There is some mineral inclusion that has infused with the outer layer of quartz and turned it gray. On pic 5 and 6 on the backside the small attached crystal is broken at the base and you can see the clear quartz center and a ring about 2mm around the outside of gray quartz. I have no idea what it is, could be Rare but probably not it is quartz after all. Eithor way the piece is very nice with or without inclusions. A cluster any quartz collector would be happy to have. Acrylic base is 1x1 inch and comes attached to the specimen.