jagger27

I have this geode that my cousin gave to me a few years ago. I was wondering how much it's worth. A geography teacher told me that it's exceptionally rare, but I'd love to know more about it. These pictures should be enough of a description. So, it's about 9cm long, 6.5cm wide, and 3.5 deep in a rough dome shape. How much could it be worth? Thanks. EDIT: I also have a higher res overview: IMG_6887.JPG