Na-(Mg,Fe)-margarite
A variety of Margarite
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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.
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 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)
GUID
(UUID V4):
(UUID V4):
a9116aec-c876-4c58-bce8-8c717953ebca (as Na-(Mg,Fe)-margarite)
9ee7406e-a850-4955-b40b-0243ff3abf56 (as Margarite)
9ee7406e-a850-4955-b40b-0243ff3abf56 (as Margarite)
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 % | 0 % |
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 | " " |
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
France | |
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Norway | |
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