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Quartz-syenite

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A syenite with 5-20% quartz on the QAPF diagram, and no foids


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Classification of Quartz-syeniteHide

QAPF_P_7*.png

Quartz-syenite is in section 7* of the QAPF diagram.

Sub-divisions of Quartz-syeniteHide

Mineralogy of Quartz-syeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2

Age distributionHide

Recorded ages:
Mesoproterozoic to Cretaceous : 1190 ± 25 Ma to 92 ± 2 Ma - based on 11 recorded ages.

Internet Links for Quartz-syeniteHide

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