This bi-colored fluorite is from the Les Tolonen 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. It shows two shades of purple and light blue, leading to a yellow core. It shows several intergrown crystals in excellent condition with only a small ding on one edge near the far right side. Good bi-colored fluorites are hard to find regardless of where you look worldwide.