Fluorite is one of my favourite stones because it comes in such gorgeous colours
The UK actually has fluorspar in Derbyshire - the famous Blue John mine was first discovered by the Romans two thousand years ago. I believe it is virtually mined-out and only small amounts of fluorspar are found now.
I agree with kryztyna about it enhancing clarity of thought and concentration. I have a deep purple and green fluorite obelisk which I keep on my desk. It helps to focus my mind if I'm wrestling with a difficult problem.
I've always thought of purple fluorite as being similar to amethyst as a spiritual crystal, green fluorite for healing and blue fluorite for mental clarity.
The number of times you see fluorite on the web and it's spelt 'flour-ite' ... makes me shudder
But that's probably just me being 'Virgoan'
Dreamer