Nepheline-bearing-alkali-feldspar-syenite
A rock classification type
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Unique Identifiers
Mindat ID:
48186
Long-form identifier:
mindat:1:1:48186:7
GUID
(UUID V4):
(UUID V4):
12f79e35-0c54-44b3-b80d-1b74a6c3af03
Classification of Nepheline-bearing-alkali-feldspar-syenite
- Rock
- Igneous rock
- Normal crystalline igneous rock
- Coarse-grained ("plutonic") crystalline igneous rock
- Syenitoid
- Foid-bearing-alkali-feldspar-syenite
- Nepheline-bearing-alkali-feldspar-syenite
- Foid-bearing-alkali-feldspar-syenite
- Syenitoid
- Coarse-grained ("plutonic") crystalline igneous rock
- Normal crystalline igneous rock
- Igneous rock
Foid-bearing-alkali-felddspar-syenite is in section 6' of the QAPF diagram.
Sub-divisions of Nepheline-bearing-alkali-feldspar-syenite
- Nepheline-bearing-alkali-feldspar-syenite
Mineralogy of Nepheline-bearing-alkali-feldspar-syenite
Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > Hornblende | An informal name for dark green to black amphiboles, mostly ferro-hornblende or ... |
Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
References for Nepheline-bearing-alkali-feldspar-syenite
Reference List: