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Eldfellite Mineral Data
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General Eldfellite Information
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 Chemical Formula: |
NaFe(SO4)2 |
| Composition: |
Molecular Weight = 270.96 gm |
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Sodium 8.48 % Na 11.44 % Na2O |
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Iron 20.61 % Fe 26.52 % FeO |
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Sulfur 23.67 % S 59.10 % SO3 |
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Oxygen 47.24 % O |
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______ ______ |
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100.00 % 97.05 % = TOTAL OXIDE |
| Empirical Formula: |
NaFe2+(SO4)2 |
| Environment: |
Volcanic sublimate. Yavapaiite group |
| IMA Status: |
Proposed IMA 2007 |
| Locality: |
Eldfell Cinder Cone, Heimaey island, Vestmannaeyjar archipelago, Iceland Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality |
| Synonym: |
IMA2007-051 |
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Eldfellite Crystallography
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| Axial Ratios: |
a:b:c =1.5622:1:1.3871 |
| Cell Dimensions: |
a = 8.022, b = 5.135, c = 7.123, Z = 2; beta = 92.15° V = 293.21 Den(Calc)= 3.07 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.77(1), 3.72(0.76), 2.37(0.63),2.72(0.57), 3.43(0.54), 3.64(0.54), 1.65(0.32), 2.57(0.31), |
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Optical Properties of Eldfellite
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| Optical Data: |
NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.1762) where Ncalc=Dcalc*KC+1
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Calculated Properties of Eldfellite
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| Electron Density: |
Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Eldfellite =3.07 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0063712681
Boson Index = 0.9936287319 |
| Photoelectric: |
PEEldfellite = 7.70 barns/electron
U=PEEldfellite x rElectron Density= 23.20 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eldfellite is Not Radioactive |
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Eldfellite Classification
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| Dana Class: |
28.03.04.02 (28)Anhydrous Acid and Sulfates |
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(28.03)(A++) XO4 |
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(28.03.04)Dana Group |
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28.03.04.01 Yavapaiite KFe(SO4)2 C 2/m 2/m |
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28.03.04.02 Eldfellite NaFe(SO4)2 C 2/m 2/m |
| Strunz Class: |
07.AC.15 07 - SULFATES (SELENATES, TELLURATES) |
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07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O |
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07.AC -With medium-sized and large cations |
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07.AC.15 Yavapaiite KFe(SO4)2 C 2/m 2/m |
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07.AC.15 Eldfellite NaFe(SO4)2 C 2/m 2/m |
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Other Eldfellite Information
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| See Also: |
Links to other databases for Eldfellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
Search for Eldfellite using:
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Mineral Discussion Forum from Fabre Minerals - also available in
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Print or Cut-and-Paste your Eldfellite Specimen Label here :
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Eldfellite
NaFe(SO4)2
Dana No: 28.03.04.02 Strunz No: 07.AC.15
Locality:
Notes:
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