This is a fairly good article on the recently discovered symmetry in a cobalt niobate compound. The article is rather lightweight on the actual work, and has more to do with explaining symmetry in a condensed matter system.
The actual work was published in Science this week.
Edit: You may read a review of this work at the PhysicsWorld website as well.
 R. Coldea et al., Science v.327, p. 177 (2010).