Fluorite – Denton Mine, Cave-in-Rock District, Hardin County, Illinois, USA
 
A fluorite specimen with an intense purple color that has grown together from several fluorites. The entire specimen is a so-called floater, i.e. during its formation, the fluorite has detached itself from the matrix and all contact points are perfectly recrystallized all around.
Specimens like this are the reason why Illinois fluorites are so popular.