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Nepheline-bearing-syenite

A rock classification type
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A foid-bearing-syenite where nepheline is the most abundant foid.


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Unique IdentifiersHide

Mindat ID:
48194
Long-form identifier:
mindat:1:1:48194:6

Classification of Nepheline-bearing-syeniteHide

QAPF_P_7-.png

Foid-bearing-syenite is in section 7' of the QAPF diagram.

Mineralogy of Nepheline-bearing-syeniteHide

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.
Feldspathoid > NephelineNa3K(Al4Si4O16)
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Internet Links for Nepheline-bearing-syeniteHide

References for Nepheline-bearing-syeniteHide

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