Those of you who know about datolites know that they are really fought over by Michigan collectors. This is because they come in such a range of subtly pretty colors that the variety of specimens is endless, due to the numerous types of inclusions that give them their hues; so many people have a collection of datolites as a special sub-section of their collections. Unfortunately, they are not common. This is a BIG one, with a gorgeous rusty-red center (probably from hematite) - highly polished to bring out the beauty. If you look closely, you can see little inclusions of native copper around the rim.