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Sodic plagioclase
A synonym
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About Sodic plagioclase
Synonym of:
A petrological term for plagioclase feldspars dominant in sodium.
In pure mineralogical terms the name albite would be synonymous.
In pure mineralogical terms the name albite would be synonymous.
Unique Identifiers
Mindat ID:
48008
Long-form identifier:
mindat:1:1:48008:0
Pronunciation of Sodic plagioclase
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Age distribution
Recorded ages:
Neoarchean to Neogene : 2640 ± 11 Ma to 9.8 ± 0.3 Ma - based on 15 recorded ages.
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SiO2 | 66.31 % | 68.65 % | 66.16 % | 63.98 % | 64.85 % | 62.69 % | 59.15 % | 66.80 % | 65.99 % | 67.99 % | 63.27 % |
| Al2O3 | 20.61 % | 19.33 % | 20.85 % | 22.14 % | 21.41 % | 23.80 % | 24.62 % | 20.21 % | 19.96 % | 19.52 % | 23.27 % |
| MgO | 0.07 % | 0.04 % | 0.09 % | 0.02 % | 0.13 % | ||||||
| CaO | 0.41 % | 2.66 % | 3.10 % | 2.64 % | 5.03 % | 7.32 % | 0.72 % | 0.40 % | 3.93 % | ||
| MnO | 0.00 % | 0.09 % | 0.08 % | 0.02 % | 0.01 % | ||||||
| FeO | 0.02 % | 0.10 % | 0.24 % | 0.06 % | 0.21 % | 0.05 % | |||||
| Na2O | 11.61 % | 11.77 % | 10.20 % | 9.64 % | 10.20 % | 8.66 % | 7.95 % | 9.42 % | 11.34 % | 11.51 % | 9.23 % |
| K2O | 0.11 % | 0.04 % | 0.15 % | 0.12 % | 1.50 % | 1.45 % | 0.74 % | 0.19 % | |||
| TiO2 | 0.16 % | 0.03 % | |||||||||
| Cr2O3 | 0.06 % | ||||||||||
| P2O5 | 0.02 % | ||||||||||
| H2O | 1.04 % | ||||||||||
| Total: | 99.14 % | 99.75 % | 99.87 % | 99.25 % | 99.64 % | 100.33 % | 99.24 % | 98.9 % | 99.78 % | 100.16 % | 100.08 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 2 | Na1.00Al1.00Si3.00O8 |
| 3 | (Na0.88Ca0.13) E1.01 Al1.08Si2.91O8 |
| 4 | (Na0.33 Ca0.15) Al1.16Si2.84O8 |
| 5 | Na0.79 Ca0.21Al1.17Si2.87O8 |
| 6 | Na0.74 Ca0.24Al1.24Si2.76O8 |
| 7 | Ab69An31 |
Sample references:
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada