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Nepheline-syenitic-rock

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About Nepheline-syenitic-rockHide

A foid-syenitoid where nepheline is the most abundant foid.


Classification of Nepheline-syenitic-rockHide

QAPF_P_11,12-.png

Foid-syenitic-rocks are in sections 11 and 12 of the QAPF diagram.

Sub-divisions of Nepheline-syenitic-rockHide

Mineralogy of Nepheline-syenitic-rockHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspathoid > NephelineNa3K(Al4Si4O16)
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)([Si/Al]Si2O10)(OH/F)2

Internet Links for Nepheline-syenitic-rockHide

 
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