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I actually bought this crystal by mistake: I was going through looking up the name of every single mineral that contains thorium, then searching on eBay to see if I could buy one of them. (I needed more pictures of thorium crystals to use for the short-lived radioactive elements that appear in the thorium decay chain.) For some reason I got confused and bough this one too: It's titanium dioxide with no hint of anything radioactive. But it's pretty just the same!
This is officially described as Brookite and smoky quartz from Magnet Cove.
Source: eBay seller crystaldigger
Contributor: Theodore Gray
Acquired: 20 September, 2005
Price: $29
Size: 2.2"
Composition: TiO2