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Augite syenite
A rock subtype
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About Augite syenite
Unique Identifiers
Mindat ID:
48221
Long-form identifier:
mindat:1:1:48221:9
Classification of Augite syenite
Syenite is in section 7 of the QAPF diagram.
Sub-divisions of Augite syenite
- Augite syenite
Mineralogy of Augite 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. |
| Pyroxene > Clinopyroxene > Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
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 |
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 55.75 % |
| TiO2 | 1.43 % |
| Al2O3 | 16.31 % |
| Fe2O3 | 3.09 % |
| FeO | 6.23 % |
| MnO | 0.21 % |
| MgO | 1.32 % |
| CaO | 3.54 % |
| Na2O | 5.91 % |
| K2O | 4.92 % |
| P2O5 | 0.5 % |
| H20 | 0.57 % |
| Total: | 99.78 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | IlÃmaussaq complex, Kujalleq, Greenland | Average of 8 analyses of a rock containing K-feldspar/perthites (72.4 vol%), pyroxene (6.9vol%), amphibole(3.7 vol%), olivine (6.3 vol%), mica (5.5 vol%), apatite (1 vol%), opaques (3.6 vol%), chlorite (0.6 vol%) & nepheline (tr). Analytical method is not given but presumably wet chemical. |
Internet Links for Augite syenite
mindat.org URL:
https://www.mindat.org/min-48221.html
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References for Augite syenite
Reference List:
Almenningen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway