# Syenogranite

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Intrusive igneous rock

Syenogranite Igneous rock

**Syenogranite** is a fine to coarse grained [intrusive](/source/Intrusive_rock) rock of the same general composition as [granite](/source/Granite). For example, the syenogranite in the [Salmon Mountains](/source/Salmon-Challis_National_Forest) in Idaho is pink to tan and composed of 45–55% alkali feldspar, 15–20% [plagioclase](/source/Plagioclase), 15–20% [quartz](/source/Quartz), 5–8% [biotite](/source/Biotite), 3–5% [hornblende](/source/Hornblende), and accessory [magnetite](/source/Magnetite) (Evans and Green, 2003).

Syenogranite is similar to [syenite](/source/Syenite). Some syenogranite contain hornblende, while also contain biotite, plagioclase (An3), and quartz. (Mafti, 2001). It is in the Sao Jose do Campestre [Massif](/source/Massif) in [Brazil](/source/Brazil) (Benjamin et al., 1998).

## See also

- [syenite](/source/Syenite)

- [monzogranite](/source/Monzogranite)

- [granite](/source/Granite)

## References

- Bley, Benjamin, Peter Christian Hackspacher, Elton Luizdantas, and William Randall Van Schmus. (1998) "Archean Accretion in the Sao Jose do Campestre Massif, Borborema Province, Northeast Brazil." Revista Brasileirade Geociencias, Vol. 28 [\[1\]](http://www.sbgeo.org.br/rgb/vol28_down/2802/2802221.pdf)

- Karl V. Evans and Gregory N. Green (2003) “Geological Map of the Salmon National Forest and Vicinity, East-Central Idaho.” U.S. Department of the Interior, U. S. Geological Survey.[\[2\]](https://pubs.usgs.gov/imap/i-2765/i-2765_508.pdf) This article incorporates text from this source, which is in the [public domain](/source/Public_domain).

- Mafti, Mohammed Rashad H. (2001) "Age, Geochemistry and Origin of the Peraluminous A-Type Granitoids of the Ablah-Shuwas Pluton, Ablah Graben Arabian Shield." Faculty of Earth Sciences, King Abdulaziz University, Acta Mineralogica-Petrographica, Vol. 42, pp. 5–20.[\[3\]](http://acta.bibl.u-szeged.hu/25085/1/mineralogica_042_005-020.pdf)

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