DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Syenite igneous rock. Syenite is an igneous rock that forms when volcanic magma solidifies under pressure in the Earth's crust. It is coarse- grained, and similar in composition to granite except that it contains little or no quartz. It is composed of feldspar, mica, hornblende and pyroxene minerals. Syenite is relatively uncommon, found mainly in a few areas of the United States and Germany. This sample measures 120 millimetres across.
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