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Eifelite

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Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© Stephan Wolfsried

Show Eifelite Photos (6)
Formula:
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
System:HexagonalHardness:5 - 6


Osumilite Group. Eifelite-Roedderite Series.

Classification of Eifelite

IMA status:Approved
Strunz 8th edition ID:8/E.22-30
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.4

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:14.4.13

14 : Silicates not Containing Aluminum
4 : Silicates of Mg
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Type Occurrence of Eifelite

Type Locality:Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
Year of Discovery:1980

Physical Properties of Eifelite

Hardness (Mohs):5 - 6

Crystallography of Eifelite

Crystal System:Hexagonal
Cell Parameters:a = 10.13Å, c = 14.22Å
Ratio:a:c = 1 : 1.404
Unit Cell Volume:V 1,263.71 ų (Calculated from Unit Cell)

Optical Data of Eifelite

Type:Uniaxial (+)
RI values: nω = 1.543 - 1.545 nε = 1.544 - 1.546
Maximum Birefringence:δ = 0.001

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Eifelite

Formula:
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
Essential elements:K, Mg, Na, O, Si
All elements listed in formula:K, Mg, Na, O, Si
Common Impurities:Ti,Al,Cr,Mn,Fe,Cu,Zn

Relationship of Eifelite to other Species

Series:Forms a series with Roedderite (see here)
Related Minerals - Nickel-Strunz Grouping):
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
9.CM.05Brannockite
(K,Na)Li
 
3
Sn
 
2
Si
 
12
O
 
30
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
9.CM.05Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
9.CM.05Osumilite
(K,Na)(Fe,Mg)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sogdianite
(K,Na)
 
2
(Li,Fe)
 
3
(Zr,Ti,Fe)Si
 
12
O
 
30
9.CM.05Sugilite
KNa
 
2
(Fe,Mn,Al)
 
2
Li
 
3
Si
 
12
O
 
30
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
KLi
 
3
Ti
 
2
Si
 
12
O
 
30
9.CM.05Dusmatovite
K(K,Na,[ ])(Mn
2+
 
,Y,Zr)
 
2
(Zn,Li)
 
3
Si
 
12
O
 
30
9.CM.05Shibkovite
K(Ca,Mn,Na)
 
2
(K
 
2-x
,□
 
x
)
 
2
ZnSi
 
12
O
 
30
9.CM.05Almarudite
(K,Na)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
([],K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[Si
 
12
O
 
30
]
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:
14.4.1Forsterite
Mg
 
2
[SiO
 
4
]
14.4.2Enstatite
Mg
 
2
[SiO
 
3
]
 
2
14.4.3Clinoenstatite
Mg
 
2
[Si
 
2
O
 
6
]
14.4.4Chrysotile
Mg
 
3
Si
 
2
O
 
5
(OH)
 
4
14.4.5Clinochrysotile
14.4.6Orthochrysotile
14.4.7Parachrysotile
14.4.8Lizardite
Mg
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
14.4.9Talc
Mg
 
3
Si
 
4
O
 
10
(OH)
 
2
14.4.10Spadaite
MgSiO
 
2
(OH)
 
2
·H
 
2
O
14.4.11Sepiolite
Mg
 
4
Si
 
6
O
 
15
(OH)
 
2
·6H
 
2
O
14.4.12Loughlinite
Na
 
2
Mg
 
3
Si
 
6
O
 
16
·8H
 
2
O
14.4.14Stevensite
(Ca,Na)
 
x
Mg
 
3
Si
 
4
O
 
10
(OH)
 
2
14.4.15Antigorite
(Mg,Fe
2+
 
)
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
14.4.16 Magnesio-anthophyllite

Other Names for Eifelite

Synonyms:
IMA1980-097
German names:
Eifelit
Russian names:
Эйфелит
Spanish names:
Eifelita

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 Eifelite

Reference List:Abraham, K.. Gebert, W., Medenbach, 0., Schreyer, W., Hentschel, G., (1980):
KNa3Mg4,5[Si12O30], ein neues Mineral der Milaritgruppe aus der Eifel, mit Natrium in Oktaederposition Fortschr. Mineral. 58, Beih. 1, 3-4.

Abraham, K., Gebert, W., Medenbach. 0.; Schreyer, W., Hentschel, G., (1983):
Eifelite, KNa3Mg4Si12O30, a New Mineral of the Osumilite Group with Octahedral Sodium Contr. Mineral. Petrol. 82, 252-258.

American Mineralogist: 66: 218.

American Mineralogist: 69: 566.

Internet Links for Eifelite

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    Localities for Eifelite

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    (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.
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Mayen
          • Ettringen
    		Contr. Min. Pet. 82 (1980), 252; HB2/1 (1995)
    Mineral and/or Locality
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