Question: what is the strangest colour rock you have ever found?

Laura Roberts Artal answered on 21 Jun 2013:

Hmmm, good question!
I’ve seen bright green rocks and also ones with lots of really cool colours ranging from brown, red, through to purple and blue, I liked those a lot. They were formed along a feature we call a fault which is a break between two rock units. It is where earthquakes happen and they make rocks move relative to one another (up, down, or they can make them pull away from each other).