Emeleusite
A valid IMA mineral species
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About Emeleusite
C. Henry Emeleus
Formula:
Li2Na4Fe2Si12O30
Colour:
Colorless to creamy pinkish
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.76
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of C. Henry Emeleus (4 September 1930, Belfast, Northern Ireland, UK - 11, November, 2017, Durham, UK), 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.
Type Locality:
This page provides mineralogical data about Emeleusite.
Unique Identifiers
Mindat ID:
1374
Long-form identifier:
mindat:1:1:1374:7
IMA Classification of Emeleusite
Approved
IMA Formula:
Na2LiFe3+Si6O15
Approval year:
1977
First published:
1978
Approval history:
IMA1977-021
Classification of Emeleusite
9.DN.05
9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
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
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
14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Eme | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Emeleusite
Vitreous
Transparency:
Transparent
Colour:
Colorless to creamy pinkish
Hardness:
5 - 6 on Mohs scale
Hardness Data:
Measured
Cleavage:
None Observed
Density:
2.76(7) g/cm3 (Measured) 2.81 g/cm3 (Calculated)
Comment:
From Johnsen et al (1978), Upton et al (1978) gives 2.775.
Optical Data of Emeleusite
Type:
Biaxial (-)
RI values:
nα = 1.596 nβ = 1.597 nγ = 1.597
Max. Birefringence:
δ = 0.001
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v weak
Chemistry of Emeleusite
Mindat Formula:
Li2Na4Fe2Si12O30
Element Weights:
Common Impurities:
Ti,Zr,Al,Mn,Mg,Ca,K
Crystallography of Emeleusite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
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)
Z:
8
Morphology:
{100}, {010}, {001}, {110}, {101}, {011}. Platy parallel to {010} and strongly elongated afrer [100].
Twinning:
Pseudohexagonal interpenetration triplets with {110} as twin planes.
Comment:
Space Group: Acam:
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010800 | Emeleusite | Johnsen O, Nielsen K, Sotofte I (1978) The crystal structure of emeleusite, a novel example of sechser-doppelkette Zeitschrift fur Kristallographie 147 297-306 |  | 1978 | Igdlutalik Island, Julianchab District, Greenland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.001 Å | (50) |
| 4.352 Å | (100) |
| 4.087 Å | (60) |
| 3.501 Å | (70) |
| 3.209 Å | (80) |
| 3.192 Å | (60) |
| 3.090 Å | (70) |
| 2.875 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4a: Earth’s earliest continental crust | >4.4-3.0 |
| 19 : Granitic intrusive rocks |
Type Occurrence of Emeleusite
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.
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.
Chemical Analysis of Type Material:
| SiO2 | 70.75 % |
|---|---|
| TiO2 | 0.55 % |
| ZrO2 | 0.10 % |
| Al2O3 | 1.34 % |
| Fe2O3 | 12.13 % |
| MgO | 0.10 % |
| MnO | 0.03 % |
| Li2O | 2.78 % |
| Na2O | 11.98 % |
| Total: | 99.76 % |
Geological Setting of Type Material:
Peralkaline trachyte dyke.
Associated Minerals at Type Locality:
Synonyms of Emeleusite
Other Language Names for Emeleusite
Relationship of Emeleusite to other Species
Member of:
Other Members of Tuhualite Group:
| Tuhualite | NaFe2+Fe3+Si6O15 | Orth. mmm(2/m2/m2/m) : Cmca |
| Zektzerite | LiNaZrSi6O15 | Orth. mmm(2/m2/m2/m) : Cmca |
Structurally related to group(s):
| Osumilite Group | (XIIC)(IXB)2(VIA)2(IVT2)3[(IVT1)12O30] |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.DN. | Letnikovite-(Ce) | (Na◻)Ca2Ce2[Si7O17(OH)]F4(H2O)4 |
| 9.DN.05 | Zektzerite | LiNaZrSi6O15 |
| 9.DN.05 | Tuhualite | NaFe2+Fe3+Si6O15 |
| 9.DN.10 | Semenovite-(Ce) | Na8Ca2FeBe6Ce2Si14O40(OH)4F4 |
| 9.DN.15 | Ashcroftine-(Y) | K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2O |
| 9.DN.15 | 'Ashcroftine-(Ce)' | K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8 · 8H2O |
Other Information
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 Emeleusite
mindat.org URL:
https://www.mindat.org/min-1374.html
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References for Emeleusite
Reference List:
Upton, B. G. J., Hill, P. G., Johnsen, O., Petersen, O. V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine, 42 (321) 31-34 doi:10.1180/minmag.1978.042.321.03
Upton, B. G. J., Hill, P. G., Johnsen, O., Petersen, O. V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine, 42 (321) 31-34 doi:10.1180/minmag.1978.042.321.03
Localities for Emeleusite
Showing 1 localities.
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Greenland (TL) | |
| Upton et al. (1978) |
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Illutalik dyke, Illutalik Island, Kujalleq, Greenland