Foyaite igneous rock. Foyaite, a type of nepheline syenite, is an igneous rock that forms when volcanic magma solidifies under pressure in the Earth's

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Foyaite igneous rock. Foyaite, a type of nepheline syenite, is an igneous rock that forms when volcanic magma solidifies under pressure in the Earth's crust. It is coarse- grained, and consists mostly of microcline, nepheline and aegirine minerals. This sample measures 120 millimetres across.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: crystal, crystals, earth, foyaite, geological, geology, igneous, intrusive, mineral, mineralogy, minerals, nepheline, pluton, plutonic, rock, rocks, science, stone, syenite