Minerva #1 Mine, Cave-In-Rock Sub-District, Hardin County, Illinois, USA
A sharply formed floater of blue fluorite tinged with purple from the Minerva #1 mine. It has interesting crystal features and formed with a gemmy yellow calcite. The fluorite has evidence of cube form on one side which has become highly modified, likely by dissolution and recrystallization. The calcite has a classic growth in one direction and a complex modification to the other side. It shows a dusting of what appears to be alstonite trapped in its intricate surfaces. Overall this is a highly aesthetic and geologically delightful specimen with no damage or distractions, perfect for the collector looking for a unique specimen to feature a classic locality.
6.50 x 6.00 x 4.00 cm