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Eldfellite

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Formula:
NaFe3+(SO4)2
Colour:
yellowish-green to greenish-white
Lustre:
Vitreous
Specific Gravity:
3.062 (Calculated)
Crystal System:
Monoclinic
Name:
Named for type locality, Eldfell volcano, Heimaey, Iceland
Isostructural with:
Yavapaiite Group. Chemically and structurally corresponds to the synthetic NaFe(SO4)2. The first anhydrous and hydrogen-free Na-Fe sulphate (compare the associated 'Unnamed (Na-Fe Sulphate)').

The Na analogue of Yavapaiite.
Water-sensitive and relatively unstable under ambient conditions.

Related to but not isostructural with markhininite.

Singh et al. (2015) report the mineral to be a potential cathode for the Na-ion batteries. Similar study is by Yu et al. (2016).


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Classification of EldfelliteHide

Approved
Approval Year:
2007
7.AC.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
28.3.4.2

28 : ANHYDROUS ACID AND NORMAL SULFATES
3 : AXO4

Physical Properties of EldfelliteHide

Vitreous
Colour:
yellowish-green to greenish-white
Streak:
white
Comment:
soft
Cleavage:
Perfect
{001} (basing on the structure analysis)
Density:
3.062 g/cm3 (Calculated)

Chemical Properties of EldfelliteHide

Formula:
NaFe3+(SO4)2
Common Impurities:
Mg,P

Crystallography of EldfelliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 8.0 43(4) Å, b = 5.139(2) Å, c = 7.115(4) Å
β = 92.13(2)°
Ratio:
a:b:c = 1.557 : 1 : 1.385
Unit Cell V:
293.9 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.73 (80)
3.64 (50)
3.43 (50)
2.77 (100)
2.72 (60)
2.57 (30)
2.370 (60)
1.650 (30)

Type Occurrence of EldfelliteHide

General Appearance of Type Material:
soft, fragile aggregates (along with opal and tamarugite) of thin platy ({001}) crystals, up to 0.02 mm; may be rosette-forming
Place of Conservation of Type Material:
Icelandic Institute of Natural History, Reykjavík, Iceland (registration no.: NI 13556)
Geological Setting of Type Material:
fumarolic encrustations close to the surface
Associated Minerals at Type Locality:

Synonyms of EldfelliteHide

Other Language Names for EldfelliteHide

Relationship of Eldfellite to other SpeciesHide

Other Members of this group:
YavapaiiteKFe(SO4)2Mon. 2/m : B2/m

Related Minerals - Nickel-Strunz GroupingHide

7.AC.Aluminopyracmonite(NH4)3Al(SO4)3Trig. 3 : R3
7.AC.Acmonidesite(NH4,K,Pb)8NaFe2+4(SO4)5Cl8Orth. 2 2 2 : C2 2 21
7.AC.05VanthoffiteNa6Mg(SO4)4Mon. 2/m : P21/b
7.AC.08Pyracmonite(NH4)3Fe(SO4)3Trig. 3m : R3c
7.AC.10Efremovite(NH4)2Mg2(SO4)3Iso.
7.AC.10LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
7.AC.10ManganolangbeiniteK2Mn2(SO4)3Iso. 2 3 : P21 3
7.AC.15YavapaiiteKFe(SO4)2Mon. 2/m : B2/m
7.AC.20Godovikovite(NH4)Al(SO4)2Trig. 3 2 : P3 2 1
7.AC.20Sabieite(NH4)Fe3+(SO4)2Trig. 3 2 : P3 2 1
7.AC.25ThénarditeNa2SO4Orth. mmm (2/m 2/m 2/m) : Fddd
7.AC.30MetathénarditeNa2SO4Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.AC.35Aphthitalite(K,Na)3Na(SO4)2Trig.

Related Minerals - Dana Grouping (8th Ed.)Hide

28.3.4.1YavapaiiteKFe(SO4)2Mon. 2/m : B2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for EldfelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stoiber, R.E., Rose, W.I., Jr. (1969) Recent volcanic and fumarolic activity at Santiaguito volcano, Guatemala. Bulletin of Volcanology: 33: 475-502.
Giester, G. (1993) Crystal structure of the yavapaiite type compound NaFe[SeO4]2. Mineralogy and Petrology: 48: 227-233.
Jakobsson, S.P., Leonardsen, E.S., Balic-Zunic, T., Jónsson, S.S. (2008) Encrustations from three recent volcanic eruptions in Iceland: The 1963-1967 Surtsey, the 1973 Eldfell and the 1991 Hekla eruptions. Fjölrit Náttúrufrædistofnunar: 52: 5-67.
Balic-Zunic, T., Garavelli, A., Acquafredda, P., Leonardsen, E., Jakobsson, S.P. (2009) Eldfellite, a new fumarolic mineral from Eldfell volcano, Iceland. Mineralogical Magazine: 73: 51-57.
Piilonen, P.C., Poirier, G. (2010) New mineral names. American Mineralogist: 95: 204-208.
Singh, P., Shiva, K., Celio, H., Goodenough, J.B. (2015) Eldfellite, NaFe(SO4)2: an intercalation cathode host for low-cost Na-ion batteries. Energy and Environmental Science: 8: 3000-3005.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)
Yu, C.-J., Choe, S.-H., Ri, G.-C., Jong, U.-G., Hong, S.-N. (2016) First-principles Study of Crystal Structure and electronic properties of SIB cathode material - NaFe(SO4)2. arXiv:1605.04947 [cond-mat.mtrl-sci]

Internet Links for EldfelliteHide

Localities for EldfelliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Guatemala
 
  • Quetzaltenango Department
    • El Palmar
Stoiber, R.E. & Rose, W.I., Jr. (1969): Recent volcanic and fumarolic activity at Santiaguito volcano, Guatemala. Bulletin of Volcanology, 33, 475-502.
Iceland (TL)
 
  • Southern Region
    • Vestmannaeyjar archipelago (Westman islands)
      • Heimaey island
        • Heimaey
Balić-Žunić, T., Garavelli, A., Acquafredda, P., Leonardsen, E., & Jakobsson, S. P. (2009). Eldfellite, NaFe (SO4) 2, a new fumarolic mineral from Eldfell volcano, Iceland. Mineralogical Magazine, 73(1), 51-57.
Mineral and/or Locality  
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