A good, Illinois blue fluorite is a "must-have," for a good mineral collection. This is a fine example, with a gemmy blue depth reminiscient of a glacier, and with a purplish, pyramidal phantom-core visible deep inside it. It is neatly covered with snow white Barite that gives a pleasant contrast to the gemmy blue color. There's no damage on the top corner, or the right or back edges. The left corner has a small cleavage, it doesn't detract. I got this out of Les Tolonen's collection, We were able to acquire 100 flats from him representing his 100 trips to the cave-in-rock district spanning 35 years of his doing business in the area while it was in production.