Add Yahoo as a preferred source to see more of our stories on Google. A close-up photo of a rock containing a raw gold nugget in a mine. Rocks and minerals hold precious clues about how Earth formed ...

What is the difference between a rock and a stone? What is a rock? What is a stone? There is a difference. Find out what it is. Major Funding by the Laura Moore Cunningham Foundation and Idaho ...

There are about 6,000 different types of minerals, but only a couple hundred are gemstones. Learn more about these special minerals and how someone like you can find your own gemstone. Science Trek is ...