(2/2) DEEPER THAN CAN BE DUG: Olivine -- making up much of the upper mantle of the Earth, and one of Earth's most abundant minerals by volume -- is unusual on the surface.

Like diamond, this yellow-green to olive-green mineral rides up with some lava flows, where Humans can reach it. It also is sometimes found as a rider on meteorites.

When of gemstone quality, it's also known as peridot.