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Eldfellite

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Formula:
NaFe
3+
 
(SO
 
4
)
 
2
System:MonoclinicColour:yellowish-green to ...
Member of:Yavapaiite Group
Name:Named for type locality, Eldfell volcano, Heimaey, Iceland
Isostructural with:Yavapaiite


Yavapaiite Group.
The Na analogue of Yavapaiite.

Water-sensitive and relatively unstable under ambient conditions.

Classification of Eldfellite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:28.3.4.2

28 : ANHYDROUS ACID AND NORMAL SULFATES
3 : AXO4
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Type Occurrence of Eldfellite

Type Locality:Eldfell, Heimaey, Heimaey island, Vestmannaeyjar archipelago (Westman islands), Iceland
General Appearance of Type Material:soft, fragile aggregates of thin platy crystals
Associated Minerals at type locality:
TamarugiteRalstoniteOpalHematiteGypsum
BassaniteAnhydrite

Occurrences of Eldfellite

Geological Setting:fumarolic

Physical Properties of Eldfellite

Colour:yellowish-green to greenish-white
Streak:white
Density (calculated):3.062 g/cm3

Crystallography of Eldfellite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
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 Volume:V 293.9 ų
Z:2
X-Ray Powder Diffraction:
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)

Chemical Properties of Eldfellite

Formula:
NaFe
3+
 
(SO
 
4
)
 
2
Essential elements:Fe, Na, O, S
All elements listed in formula:Fe, Na, O, S
Empirical Formula:
NaFe
3+
 
(SO
 
4
)
 
2

Relationship of Eldfellite to other Species

Member of:Yavapaiite Group
Other Members of Group:

- +
Yavapaiite
KFe(SO
 
4
)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
7.AC.05Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
7.AC.10Efremovite
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
7.AC.10Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
7.AC.10Manganolangbeinite
K
 
2
Mn
 
2
(SO
 
4
)
 
3
7.AC.15Yavapaiite
KFe(SO
 
4
)
 
2
7.AC.20Godovikovite
(NH
 
4
)Al(SO
 
4
)
 
2
7.AC.20Sabieite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
7.AC.25Thenardite
Na
 
2
SO
 
4
7.AC.30Metathenardite
Na
 
2
SO
 
4
7.AC.35Aphthitalite
(K,Na)
 
3
Na(SO
 
4
)
 
2

Other Names for Eldfellite

Synonyms:
IMA2007-051
Other Languages:

Other Information

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

References for Eldfellite

Reference List:

- +
Stoiber, R.E. & Rose, W.I., Jr. (1969): Recent volcanic and fumarolic activity at Santiaguito volcano, Guatemala. Bulletin of Volcanology, 33, 475-502.

Balic-Zunic, T. et al.(2009): Eldfellite, a new fumarolic mineral from Eldfell volcano, Iceland. Mineralogical Magazine 73,51-57(2009)

Internet Links for Eldfellite

Search Engines:
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    • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
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    • Localities for Eldfellite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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
     
    • Vestmannaeyjar archipelago (Westman islands)
      • Heimaey island
        • Heimaey
    		Min. Mag. 73,51-57(2009)
    Mineral and/or Locality
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