Yeah, I got rocks. A chunk of obsidian from Iceland may be a favourite. Peacock ore is very pretty. Fluorescent minerals are cool, get to the Sterling Hill mine if you ever can (NJ) Take a UV-B/C lamp if you can. Leds are working at shorter wavelengths now.
Gold is quite cool too, you can pan for it or scrape around for it in a lot of places. Tiny amounts but under a magnifier it's amazing. Definitely a bug.
Places around Africa and China there are loads of semi-precious as well as precious mines like amethyst and sapphire. If you're in the area and you make it known you're interested, someone will know someone....... who will turn up with a bag full.
Meteorites are a little bit fascinating. If you get something that's come in from the Oort cloud, that's half way to Alpha Centauri... a trillion miles away. More likely from just beyond Mars but hey..
