Na-(Mg,Fe)-margarite
A variety of Margarite
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Formula:
(Ca,Na)(Al,Mg,Fe)2(Al2Si2O10)(OH)2
A variety of the mica margarite described by Godard and Smith (1999) as "being a solid solution between margarite and a hypothetical 2.5-octahedral end-member with the ideal formula of Na2☐1(Mg,Fe)1Al4IV[Si4Al4IV]O20(OH)4. This last composition can be considered as the (Mg, Fe) equivalent of the trioctahedral Li-mica ephesite Na2Li2Al4IV[Si4Al4IV]O20(OH)4".
Found as retrogression products in coronae or symplectitites around kyanite in eclogites.
Found as retrogression products in coronae or symplectitites around kyanite in eclogites.
Unique Identifiers
Mindat ID:
53264 (as Na-(Mg,Fe)-margarite)
2573 (as Margarite)
2573 (as Margarite)
Long-form identifier:
mindat:1:1:53264:8 (as Na-(Mg,Fe)-margarite)
mindat:1:1:2573:3 (as Margarite)
mindat:1:1:2573:3 (as Margarite)
Similar Names
Chemistry of Na-(Mg,Fe)-margarite
Mindat Formula:
(Ca,Na)(Al,Mg,Fe)2(Al2Si2O10)(OH)2
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 32.03 % | 30.72 % |
| TiO2 | 0.11 % | 0.09 % |
| Al2O3 | 49.03 % | 51.23 % |
| Cr2O3 | 0.02 % | 0.20 % |
| FeO | 1.32 % | 0.21 % |
| MnO | 0.02 % | 0.30 % |
| MgO | 1.01 % | 1.56 % |
| CaO | 8.12 % | 9.44 % |
| BaO | 0.04 % | 0.02 % |
| Na2O | 3.17 % | 2.41 % |
| K2O | 0.01 % | 0.03 % |
| F | 0.060 % | |
| Cl | 0.005 % | 0.004 % |
| Total: | 94.945 % | 96.214 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Liset eclogite pod, Liset, Selje, Stad, Vestland, Norway | Analyzed with a Cameca SX-50 electronmicroprobe at the University of Paris 7. | |
| 2 | La Compointrie, Saint-Philbert-de-Grand-Lieu, Nantes, Loire-Atlantique, Pays de la Loire, France | Analyzed with a Cameca SX-50 electronmicroprobe at the University of Paris 7. |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Na-(Mg,Fe)-margarite
mindat.org URL:
https://www.mindat.org/min-53264.html
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References for Na-(Mg,Fe)-margarite
Localities for Na-(Mg,Fe)-margarite
Showing 2 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
France | |
| Godard et al. (1999) |
Norway | |
| Godard et al. (1999) |
