Some specimens are like natural sculptures in themselves, and crystal geodes are a good example of this. Pictured is Philip who runs a crystal shop called Isis in St Albans. Geodes like this are formed in cavities in lava. The cavities fill with solutions and crystals form around the edge. A large geode like this would cost several hundred pounds, but smaller much cheaper ones are available, or you may be lucky and find one for yourself.
Crystal balls are now as popular as polished eggs.
I also saw some inclusions of iron minerals. I couldn't see into the future - but I could see the past. I saw deep inside a mountain range where two continents had collided. Molten granite had just solidified and had cracked. It was still hot.