8) heehe I'm afraid I do know rather a lot about the subject I study Biology and Geology joint honours at University so it's my thing :lol:

try scratching the seam with your fingernail, then with a copper coin, then with a knife and tell me which leave a mark on it? if you can find a piece of ...

Hiya, firstly I wanted to say what a great site and forum this is, I just lurked until now :wink: but since someones calling for a geologist I thought I'd etter crawl out of my shell 8)

Iron Pyrite (FeS2), reacts very readily with water (H2O) and free oxygen therein to produce Ferrous Iron (Fe2 ...