Show sample as: 72-frame QuickTime VR or 360-frame QuickTime movie loop.    My periodic table poster is now available! Thorianite. This is a small black pebble from near Behaera Morocco. It's fairly hot, being composed mostly of thorium. Source: SoCal (Nevada), Inc Contributor: Theodore Gray Acquired: 25 September, 2005 Price: $17 Size: 0.3" Composition: ThO2