This thread brought to mind a memory for me. I was in Montana archery hunting for elk one year and was sitting at a vantage point at around 9,500 feet one afternoon to glass and eat lunch. After I finished eating and doing some glassing, I got to rooting around on the ground where I was sitting. I scratched up a dark yellowish rock that was a bit soft and pliable. The more I dug, the more I found. I had myself convinced that it was gold. Before I knew it, I had messed around for two hours there digging the stuff up. I had about half a zip lock sandwich baggie full of it.
I could hardly concentrate on hunting I was so excited about the prospect of it being gold. When I got out of the mountains, I stopped at a jeweler/gem store in town and had the guy take a look at it. He looked the stuff over and told me to stop back in a couple hours and he'd let me know.
I went and ate lunch and made plans on spending all the money I would have. Went back to the store and found out that it was mica (sp?).
I was disappointed of course, but have a neat memory.
The real find of the day was a petrified nautilus shell about the size of a quarter that I find while I was scratching around. Still blows my mind that a marine creature once existed there and I found it how many hundreds of thousands, or millions of years later up there at over 9,000 feet in elevation.