Download your own "Mineral Baby" at The Mineral Information Institute.
MII also has information, posters, links, lesson plans, and packets for teachers (of at least the elementary grades, maybe adaptable for higher grades). Most of the support material (posters and other things) cost money; the information and "packets" are free. Some of these things are probably more useful than others - a teacher would have to evaluate them.
Here is some interesting geological info on uranium breccia pipes in Arizona, found via Arizona Geology.
And here is a nice post about copper and copper "mining" over at NOVA Geoblog.