After billions of years of turmoil during which our planet created extreme temperatures and pressures, the earth’s crust is now a complex mixture of different types of rocks and minerals. Sometimes some of these may make their way to the surface, or be exposed as we dig down to find valuable materials… and, with a range of different colors and formations, they can be incredible to look at. It's time, then, to see some of the best examples, as we reveal the 15 coolest looking rocks ever found.
#rocks #gem #gems #gemstones #top15
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