DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Diorite igneous rock. Diorite is an igneous rock that forms when volcanic magma solidifies under pressure in the Earth's crust. It is coarse- grained, consisting mostly of feldspar minerals and little, if any, quartz. This sample measures 110 millimetres across.
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