Fender Minerals has so many beautiful items I don't even know where to begin. While not a Mad Scientist of Etsy (yet?), Ms. Fender has some gorgeous samples that are of interest to any of our mad scientist rockhounds (yours truly, for example). Check out, for instance, this gorgeous piece of malachite (already one of my favorite stones):
|Polished Bullseye Malachite Nugget from Fender Minerals|
The little crystals in there are awesome! I've never seen that in malachite before. Alas the piece looks a little dinged up, but malachite is so soft it's really inevitable that it gets scratched.
If green's not to your taste, there's always iridescent chalcopyrite—the aptly named "Peacock Ore."
|Peacock Ore Chalcopyrite Ray Mine Specimen from Fender Minerals|
Something like this would be great in a little knick-knacks display shelf. This is what you'll find in my curios cabinet when I'm an old lady—not creepy ceramic children.
Fender Minerals also carries polished fossils that are drilled and ready for beading or wire-wrapping. Here's one of my favorites, an orthocera.