Found trapped in a diamond: a type of ice not known on Earth
This is fascinating. I had no idea ice could take on so many crystalline forms depending on the variety of conditions. Apparently there are other shapes even beyond those mentioned in the article: <a href="http://www1.lsbu.ac.uk/water/ice_phases.html" rel="nofollow">http://www1.lsbu.ac.uk/water/ice_phases.html</a>