Geode question

[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

Edited March 18, 2010 by jagger27

[Moontanman]

It's a pretty geode, but I do not see any reason it would be significantly more valuable than any other geode.