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Emeleusite

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Illutalik (Igdlutalik) Island, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
© Knut Eldjarn

Show Emeleusite Photos (3)
Formula:
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
System:OrthorhombicHardness:5 - 6
This page provides mineralogical data about Emeleusite.

Classification of Emeleusite

IMA status:Approved
Strunz 8th edition ID:8/E.22-100
Nickel-Strunz 10th (pending) edition ID:9.DN.05

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
Dana 8th edition ID:66.3.4.3

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
3 : Amphiboles - Ca-Na subgroup
Hey's CIM Ref.:14.20.1

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

Type Locality:Illutalik (Igdlutalik) Island, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
Year of Discovery:1978

Physical Properties of Emeleusite

Hardness (Mohs):5 - 6

Crystallography of Emeleusite

Crystal System:Orthorhombic
Cell Parameters:a = 10.07Å, b = 17.35Å, c = 14.01Å
Ratio:a:b:c = 0.58 : 1 : 0.807
Unit Cell Volume:V 2,447.75 ų (Calculated from Unit Cell)

Optical Data of Emeleusite

Type:Biaxial (-)
RI values: nα = 1.596 nβ = 1.597 nγ = 1.597
Maximum Birefringence:δ = 0.001

Chart 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 Emeleusite

Formula:
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
Essential elements:Fe, Li, Na, O, Si
All elements listed in formula:Fe, Li, Na, O, Si
Common Impurities:Ti,Zr,Al,Mn,Mg,Ca,K

Relationship of Emeleusite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DN.05Tuhualite
(Na,K)
 
2
Fe
 
2
Fe
 
2
Si
 
12
O
 
30
·H
 
2
O
9.DN.05Zektzerite
LiNa(Zr,Ti,Hf)Si
 
6
O
 
15
9.DN.10Semenovite-(Ce)
(Na,Ca)
 
9
Fe
2+
 
(Ce,La)
 
2
[(Si,Be)
 
5
(O,OH,F)
 
12
]
 
4
9.DN.15Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
·8H
 
2
O
Related Minerals - Hey's Index Grouping:
14.20.2Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
14.20.4Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
[O
 
2
|Si
 
6
O
 
18
]
14.20.5Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
·4H
 
2
O
14.20.6Riebeckite
[ ][Na
 
2
][Fe
2+
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
14.20.7 Ferri-annite
14.20.8Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
14.20.9Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
[(OH,F)
 
2
|Si
 
4
O
 
10
]
 
2

Other Names for Emeleusite

Synonyms:
IMA1977-021
German names:
Emeleusit
Russian names:
Эмелеусит
Spanish names:
Emeleusita

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 Emeleusite

Reference List:American Mineralogist: 64: 242.

Mineralogical Magazine: 42: 31-34.

Zeitschrift für Kristallographie: 147: 297-306.

Internet Links for Emeleusite

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    Localities for Emeleusite

    (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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
    		Min. Mag. 42 (1979), 31-34
    Mineral and/or Locality
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