This fluorite is crystallized on both sides. It exhibits a purple-blue color with a slight yellow core, and a sprinkling of Chalcopyrites on its surface. It's in good condition with only two very minor dings. It comes from the Les Tolonen collection. We purchased his high grade stash of Illinois fluorites, that took him over 30 years to accumulate. Pic #3 shows it's back side (also quite attractive).