GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Kimberlite pipe, cutaway artwork. Kimberlite is an igneous rock that is found in the Earth's crust in vertical structures (grey) known as kimberlite pipes. The pipes are formed by explosive eruptions of magma (orange) from below the Earth's surface. Kimberlite is the parental rock of diamonds and such pipes are the largest source of mined diamonds.
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