Syenite
Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%). It is considered a granitoid. Some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate composition.
| Igneous rock | |
| Composition | |
|---|---|
| Classification | Felsic |
| Plagioclase and K-Feldspars, depleted in quartz | |
| Texture | Aphanitic |
| Equivalents | Trachyte extrusively |
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