check this site too http://wlodb.com/items/219
you get a lot of compound formulas.
I got mica rocks quite a few times by random compounding, and I used some of them... :)
I think you can collect them at the cave behind Troll, the underground cave or something? well, the tunnel going to south island. But I am not sure, you can try that.
Tips for gathering materials: try to make as many alts remoting as possible, materials just keep pouring in!!!