Quartz-syenite
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A syenite with 5-20% quartz on the QAPF diagram, and no foids
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 | An informal name for dark green to black amphiboles, mostly ferro-hornblende or ... |
Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
Age distribution
Recorded ages:
Mesoproterozoic to Cretaceous : 1190 ± 25 Ma to 92 ± 2 Ma - based on 11 recorded ages.
Internet Links for Quartz-syenite
mindat.org URL:
https://www.mindat.org/min-48211.html
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