Eldfellite (original) (raw)

A valid IMA mineral species

Colour:

yellowish-green to greenish-white

Specific Gravity:

3.062 (Calculated)

Crystal System:

Monoclinic

Name:

Named for type locality, Eldfell volcano, Heimaey, Iceland

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).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:35791:3

29a57d35-e1e7-43c0-ad7b-a201199b26db

IMA Classification of EldfelliteHide

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Classification of EldfelliteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of EldfelliteHide

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Transparency:

Transparent, Translucent

Colour:

yellowish-green to greenish-white

Cleavage:

Perfect
{001} (basing on the structure analysis)

Density:

3.062 g/cm3 (Calculated)

Chemistry of EldfelliteHide

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Mindat Formula:

NaFe3+(SO4)2

Crystallography of EldfelliteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.043(4) Å, b = 5.139(2) Å, c = 7.115(4) Å
β = 92.13(2)°

Ratio:

a:b:c = 1.565 : 1 : 1.385

Crystal StructureHide

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CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

fumarolic

Type Occurrence of EldfelliteHide

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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

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Relationship of Eldfellite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 EldfelliteHide

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References for EldfelliteHide

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Reference List:

Balić-Žunic, 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 doi:10.1180/minmag.2009.073.1.51

Localities for EldfelliteHide

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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

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- 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.