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Emeleusite

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Formula:
Li2Na4Fe2Si12O30
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.76
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of C. Henry Emeleus, geologist and professor in the Department of Geological Sciences, University of Durham, UK. He is an expert on the igneous rocks of northwest Britain and Greenland.
This page provides mineralogical data about Emeleusite.


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Classification of EmeleusiteHide

Approved
Approval Year:
1977
First Published:
1978
Approval History:
IMA1977-021
8/E.22-100
9.DN.05

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
66.3.4.3

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
3 : Amphiboles - Ca-Na subgroup
14.20.1

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals

Physical Properties of EmeleusiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Hardness:
5 - 6 on Mohs scale
Hardness Data:
Measured
Cleavage:
None Observed
Density:
2.76 g/cm3 (Measured)    2.81 g/cm3 (Calculated)
Comment:
From Johnsen et al (1978), Upton et al (1978) gives 2.775.

Optical Data of EmeleusiteHide

Type:
Biaxial (-)
RI values:
nα = 1.596 nβ = 1.597 nγ = 1.597
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of EmeleusiteHide

Formula:
Li2Na4Fe2Si12O30
IMA Formula:
Na2LiFe3+Si6O15
Common Impurities:
Ti,Zr,Al,Mn,Mg,Ca,K

Crystallography of EmeleusiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 10.07 Å, b = 17.35 Å, c = 14.01 Å
Ratio:
a:b:c = 0.58 : 1 : 0.807
Unit Cell V:
2,447.75 ų (Calculated from Unit Cell)
Morphology:
{100}, {010}, {001}, {110}, {101}, {011}
Twinning:
Interpenetration triplets with {110} as twin planes.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.001 (50)
4.352 (100)
4.087 (60)
3.501 (70)
3.209 (80)
3.192 (60)
3.090 (70)
2.875 (60)

Type Occurrence of EmeleusiteHide

Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark.
Department of Geology, Edinburgh University, Edinburgh, Scotland.
The Natural History Museum, London, England, 1987,118.
National Museum of Natural History, Washington, D.C., USA, 146464.
Geological Setting of Type Material:
Peralkaline trachyte dyke.
Reference:
Upton, B.G.J., Hill, P.G., Johnsen, O., Petersen, O.V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine: 42: 31-34.

Synonyms of EmeleusiteHide

Other Language Names for EmeleusiteHide

Relationship of Emeleusite to other SpeciesHide

Member of:
Other Members of this group:
TuhualiteNaFe2+Fe3+Si6O15Orth.
ZektzeriteLiNaZrSi6O15Orth.
Structurally related to group(s):
Osumilite GroupA complex group of ring silicates; also known as "milarite group" (synonymous).

Related Minerals - Nickel-Strunz GroupingHide

9.DN.05TuhualiteNaFe2+Fe3+Si6O15Orth.
9.DN.05ZektzeriteLiNaZrSi6O15Orth.
9.DN.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
9.DN.15Ashcroftine-(Y)K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm

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

66.3.4.1TuhualiteNaFe2+Fe3+Si6O15Orth.
66.3.4.2ZektzeriteLiNaZrSi6O15Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.20.2AegirineNaFe3+Si2O6Mon. 2/m : B2/b
14.20.4WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1
14.20.5TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
14.20.6Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Mon. 2/m : B2/m
14.20.7 Ferri-anniteKFe2+3((Fe3+,Al)Si3O10)(OH)2
14.20.8Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric.
14.20.9Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4

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 EmeleusiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Upton, B.G.J., Hill, P.G., Johnsen, O., Petersen, O.V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine: 42: 31-34.
Johnsen, O., Nielsen, K., Sotofte, I. (1978) The crystal structure of emeleusite, a novel example of sechser-doppelkette. Zeitschrift für Kristallographie: 147: 297-306.
Fleischer, M., Chao, G.Y., Pabst, A. (1979) New mineral names. American Mineralogist: 64: 241-245.

Internet Links for EmeleusiteHide

Localities for EmeleusiteHide

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.
Greenland (TL)
 
  • Kujalleq
    • Narsaq
Upton, B.J.G. , Hill, P.G., Johnsen, O. & Petersen, O.V. (1978): Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine. 42, 31-34
Mineral and/or Locality  
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