Show sample as: 72-frame QuickTime VR or 360-frame QuickTime movie loop.    My periodic table poster is now available! Osmium tetroxide. Osmium tetroxide is extremely poisonous and volatile, so if you so much as lean over it, it can severely harm your eyes. Fortunately my sample is sealed in a glass tube inside a protective plastic outer tube. Source: Tryggvi Emilsson and Timothy Brumleve Contributor: Tryggvi Emilsson and Timothy Brumleve Acquired: 12 November, 2002 Price: Donated Size: 0.2" Purity: <20%