Syenite in alkaline rock masses
Geography
rock
Rock 3D model
stone
Mineralogy Science Popularization
Syenite
Alkaline rock mass
Alkaline rock body syenite
Neutral plutonic intrusive rock
Magmatic rock
3
Coin
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It is a type of magmatic rock that belongs to neutral deep-seated intrusive rocks. Light gray, with equigranular and spotted structures. Its silica content (about 60%) is comparable to diorite, but its alkaline content (sodium oxide, potassium oxide) is slightly higher than diorite. It is mainly composed of feldspar, amphibole, and biotite, with little or no quartz. Alkaline feldspar (usually orthoclase, plagioclase, and plagioclase) accounts for over 70% of feldspar. Often appearing as small rock masses, it forms a complex with basic and alkaline rocks.
