Cassiterite, mined in Tasmania. Image: Ralph Bottrill


Cassiterite, mined in Tasmania. Image: Ralph Bottrill

Image from Wikipedia, used under Creative Commons 3.0 license. Image by Ralph Bottrill, originally from mindat.org http://en.wikipedia.org/wiki/File:Cassiterite_-_Mt_Bischoff_mine,_Waratah,_Tasmania,_Australia.jpg