A strange duo where the quartz crystal continued interrupted growth, but that interruption let a permanent barrier set up between the two portions of the crystal and so instead of a phantom, we have a detached "cap" that sits upon the original matrix and earlier crystal growth. REALLY WEIRD things, these! I have seen these bizarre "russian doll" quartzes before only from a few historic samples. Most are big and clunky. This one is actually, as far as they go, rather elegant and a good size for a collection. Comes with a New York State Museum label denoting its origin from the G.F. Kunz collection (early 1900s).