Syenite
| Igneous rock | |
 | |
| Composition | |
|---|---|
| Classification | Felsic |
| Primary | Alkali feldspar |
| Secondary | Plagioclase, quartz, or feldspathoid |
| Texture | Phaneritic |
| Equivalents | Trachyte extrusively |
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.