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Foid-syenitoid

A rock classification type
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About Foid-syenitoidHide

A coarse-grained crystalline rock with <90% mafics, 10-60% of felsics being foids and alkali feldspar > plagioclase.


Unique IdentifiersHide

Mindat ID:
50553
Long-form identifier:
mindat:1:1:50553:8
GUID
(UUID V4):
b1854b46-77f8-461b-a355-23dd1b96b839

Classification of Foid-syenitoidHide

QAPF_P_11,_12.png

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

Sub-divisions of Foid-syenitoidHide

Mineralogy of Foid-syenitoidHide

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.
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 > HornblendeA commonly used informal name for dark green to black amphiboles, largely in the Hornblende Root Name ...
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Synonyms of Foid-syenitoidHide

Internet Links for Foid-syenitoidHide

References for Foid-syenitoidHide

Reference List:
 
Mineral and/or Locality  
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