Fluorite with Calcite

This is a very unusual piece. A lavender-purple corner formed over a previous yellow cored cube which had been topped by clear calcites and chalcopyrite sprinkles. The corner itself is nearly 100% complete, save for one end of the divergent corner, where an attachment point is obvious. The underlying cube dissoluted almost entirely. What is not clear is how the trigonal skunk was formed. My guess is that there was another introduction of solution and reformation began to take place. Most curious and novel.

Locality: Annabel Lee Mine, Hardin County, Illinois

Composition: calcium fluoride