Yes, gold:)
It's remarkable how many uses gold truly has. What about it's weight? Heavy stuff. I would love to pan for gold, as I'm in the western United States and we have lots of "hot spots" for this sort of activity. I'm afraid I may not have the patience nor the time.
There are many other materials, precious metals, only found in certain regions of Africa that are used in the most advanced technology. Fascinating that something as artificial as say an iPhone starts from natural materials found in the earth.