Na-(Mg,Fe)-margarite (original) (raw)
A variety of Margarite
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.
Unique IdentifiersHide
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Mindat ID:
53264 (as Na-(Mg,Fe)-margarite)
2573 (as Margarite)
Long-form identifier:
mindat:1:1:53264:8 (as Na-(Mg,Fe)-margarite)
mindat:1:1:2573:3 (as Margarite)
a9116aec-c876-4c58-bce8-8c717953ebca (as Na-(Mg,Fe)-margarite)
9ee7406e-a850-4955-b40b-0243ff3abf56 (as Margarite)
Chemical AnalysisHide
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Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Liset eclogite pod, Liset, Selje, Stad, Vestland, Norway | Godard, G. and Smith, D. (1999) Preiswerkite and Na-(Mg,Fe)-margarite in eclogites. Contributions to Mineralogy and Petrology 136 (1-2): 20-32 | 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 | Godard, G. and Smith, D. (1999) Preiswerkite and Na-(Mg,Fe)-margarite in eclogites. Contributions to Mineralogy and Petrology 136 (1-2): 20-32 | " " |
Other InformationHide
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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)-margariteHide
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References for Na-(Mg,Fe)-margariteHide
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Localities for Na-(Mg,Fe)-margariteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
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Locality ListHide
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