Mineralogy Database

Eldfellite Mineral Data

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General Eldfellite Information

Help on Chemical  Formula: Chemical Formula: NaFe(SO4)2
Help on Composition: Composition: Molecular Weight = 270.96 gm
   Sodium   8.48 %  Na   11.44 % Na2O
   Iron    20.61 %  Fe   26.52 % FeO
   Sulfur  23.67 %  S    59.10 % SO3
   Oxygen  47.24 %  O
          ______        ______ 
          100.00 %       97.05 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaFe2+(SO4)2
Help on Environment: Environment: Volcanic sublimate. Yavapaiite group
Help on IMA Status: IMA Status: Proposed IMA 2007
Help on Locality: Locality: Eldfell Cinder Cone, Heimaey island, Vestmannaeyjar archipelago, Iceland Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality
Help on Synonym: Synonym: IMA2007-051

Eldfellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5622:1:1.3871
Help on Cell Dimensions: Cell Dimensions: a = 8.022, b = 5.135, c = 7.123, Z = 2; beta = 92.15° V = 293.21 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: 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),

Optical Properties of Eldfellite

Help on Optical Data: Optical Data: NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.1762) where Ncalc=Dcalc*KC+1

Calculated Properties of Eldfellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Eldfellite =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0063712681
Boson Index = 0.9936287319
Help on Photoelectric: Photoelectric: PEEldfellite = 7.70 barns/electron
U=PEEldfellite x rElectron Density= 23.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eldfellite is Not Radioactive

Eldfellite Classification

Help on  Dana Class: Dana Class: (28)Anhydrous Acid and Sulfates
  (28.03)(A++) XO4
  (28.03.04)Dana Group Yavapaiite KFe(SO4)2 C 2/m 2/m Eldfellite NaFe(SO4)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 07.AC.15 07 - SULFATES (SELENATES, TELLURATES)
  07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O
  07.AC -With medium-sized and large cations
07.AC.15 Yavapaiite KFe(SO4)2 C 2/m 2/m
07.AC.15 Eldfellite NaFe(SO4)2 C 2/m 2/m

Other Eldfellite Information

Help on See Also: 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

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Ask about Eldfellite here :
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Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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Dana No: Strunz No: 07.AC.15