Nepheline-diorite
A rock classification type
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Unique Identifiers
Mindat ID:
48362
Long-form identifier:
mindat:1:1:48362:5
Classification of Nepheline-diorite
Foid-diorite is in section 14 of the QAPF diagram.
Sub-divisions of Nepheline-diorite
- Nepheline-diorite
Mineralogy of Nepheline-diorite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
| Mafic minerals | A petrological term for dark, rock-forming minerals rich in magnesium and/or iron. |
| Sodic plagioclase | A petrological term for plagioclase feldspars dominant in sodium. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Pronunciation of Nepheline-diorite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 39.63 % | 44.61 % |
| Al2O3 | 18.88 % | 15.85 % |
| TiO2 | 3.13 % | 3.56 % |
| Fe2O3 | 2.00 % | 2.00 % |
| FeO | 9.37 % | 8.24 % |
| MgO | 9.42 % | 4.71 % |
| MnO | 0.21 % | 0.26 % |
| Na2O | 4.65 % | 5.21 % |
| CaO | 8.56 % | 11.7 % |
| K2O | 1.81 % | 1.87 % |
| P2O5 | 1.28 % | 1.07 % |
| Total: | 98.94 % | 99.08 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Mont Royal, Montréal, Québec, Canada | Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2%. | |
| 2 | " " | Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2% |
Internet Links for Nepheline-diorite
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References for Nepheline-diorite
Reference List:
