Helmut said he got this from an engineer who works in a current tunnel project, and that it was a totally unique piece from a small pocket hit only a few years ago. It is really a unique thing...I have seen chlorite-included or coated gwindels, as have we all. They tend to be not so attractive. But this one, it has subtle microscopic inclusions of chlorite within that impart a green color to the crystal without numbing the luster or brightness by being macro-inclusions. As a bonus, this is a complete floater crystal, pristine all around; and has a little gem apatite at its base, underneath, as well.