Calcite (sceptered)

I picked this piece up at the Spruce Pine NC show about 12 years ago. It is unusual in that the etching reveals that the dominant crystal rooted itself onto a darker previous crystal that was included with chalcopyrites. Close examination with a light reveals the phantom inside. The termination has a slot and appears modified by the rhombohedron and I suspect it is a twin but all but one twin plane was etched away. Very cool piece. Ex Geoffrey Krasnov collection.

Locality: Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Composition: calcium carbonate