DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Norite igneous rock. Norite is a plutonic rock, or a rock that solidifies from molten magma deep below the Earth's surface. It crystallises slowly under such high temperatures and pressures to form large, coarse grains. It contains calcium- rich feldspar minerals. This sample measures 100 millimetres across.
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