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Sodalite Syenite

In modern times, syenite is generally defined as a type of intrusive igneous rock that is coarse-grained and similar in composition to granite. However, quartz is usually absent or only present in very small amounts in syenite. Most syenites are basically comprised of an alkali feldspar, such as orthoclase, albite, perthite, or microcline, and a ferromagnesian mineral. Commonly this mineral will be hornblende, but biotite and pyroxene occur frequently in the rocks as well.


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