whats the best rock you have seen and studied

Question: whats the best rock you have seen and studied
- Keywords:
  earth,
  preference
Asked by vivalamarq to Laura on 17 Jun 2013. This question was also asked by ksiolajidebt.
- Laura Roberts Artal answered on 17 Jun 2013:
  
  My favourite rocks are the ones I’m studying currently because they are some of the oldest in the world! They aren’t much to look at (I’ve seen prettier), but it is incredible to think that the rocks I hold in my hand ever day are nearly as old as the Earth!

Question: whats the best rock you have seen and studied