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Foid-syenite

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About Foid-syeniteHide

A foid-syenitic-rock where K-feldspar is >90% of feldspars.


Classification of Foid-syeniteHide

Foid-syenite is in section 11 of the QAPF diagram.

Sub-divisions of Foid-syeniteHide

Mineralogy of Foid-syeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
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 > BiotiteA series or subgroup of the Mica Group.

Internet Links for Foid-syeniteHide

Mineral and/or Locality  
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