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A coarse-grained crystalline rock with <90% mafics, 10-60% of felsics being foids and alkali feldspar > plagioclase.
Classification of Foid-syenitoidHide
Sub-divisions of Foid-syenitoidHide
- Pegmatitic foid-syenitic-rock
Mineralogy of Foid-syenitoidHide
Essential minerals - these are minerals that are required within the classification of this rock:
|Feldspar > Alkali Feldspar||Feldspar Group minerals rich in Potassium or Sodium.|
|Feldspathoid||A 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: