Quartz-syenite
A rock classification type
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A syenitic rock with felsic minerals containing 5-20% quartz on the QAPF diagram, and no foids.
A coarse grained plutonic rock comprising mostly K-feldspar with lesser quartz and plagioclase, and usually accessory mafic minerals: pyroxenes, amphiboles and biotite. It grades into granite with increasing quartz.
A coarse grained plutonic rock comprising mostly K-feldspar with lesser quartz and plagioclase, and usually accessory mafic minerals: pyroxenes, amphiboles and biotite. It grades into granite with increasing quartz.
Unique Identifiers
Mindat ID:
48211
Long-form identifier:
mindat:1:1:48211:2
Classification of Quartz-syenite
Quartz-syenite is in section 7* of the QAPF diagram.
Sub-divisions of Quartz-syenite
Mineralogy of Quartz-syenite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
| Silica > Quartz | SiO2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Age distribution
Recorded ages:
Mesoproterozoic to Cretaceous : 1190 ± 25 Ma to 92 ± 2 Ma - based on 12 recorded ages.
Internet Links for Quartz-syenite
mindat.org URL:
https://www.mindat.org/min-48211.html
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References for Quartz-syenite
Reference List:
