Eifelite
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About Eifelite
Formula:
KNa3Mg4Si12O30
Hardness:
5 - 6
Crystal System:
Hexagonal
Member of:
Name:
Named after the area of discovery.
Classification of Eifelite
Approved
8/E.22-30
9.CM.05
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.4
63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
14.4.13
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
Pronounciation of Eifelite
Pronounciation:
Play | Recorded by | Country |
---|---|---|
Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Eifelite
Hardness:
5 - 6 on Mohs scale
Optical Data of Eifelite
Type:
Uniaxial (+)
RI values:
nω = 1.543 - 1.545 nε = 1.544 - 1.546
Max Birefringence:
δ = 0.001

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemical Properties of Eifelite
Formula:
KNa3Mg4Si12O30
IMA Formula:
KNa2(MgNa)(Mg3Si12)O30
Common Impurities:
Ti,Al,Cr,Mn,Fe,Cu,Zn
Crystallography of Eifelite
Crystal System:
Hexagonal
Cell Parameters:
a = 10.13 Å, c = 14.22 Å
Ratio:
a:c = 1 : 1.404
Unit Cell V:
1,263.71 ų (Calculated from Unit Cell)
Type Occurrence of Eifelite
Synonyms of Eifelite
Other Language Names for Eifelite
Relationship of Eifelite to other Species
Member of:
Other Members of this group:
Agakhanovite-(Y) | (YCa)□2KBe3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Almarudite | K(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
Aluminosugilite | KNa2Al2Li3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Armenite | BaCa2Al6Si9O30 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pnna |
Berezanskite | K□2Li3(Ti,Zr,Sn)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Brannockite | (K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Chayesite | KMg4Fe3+[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Darapiosite | K(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Dusmatovite | K(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Friedrichbeckeite | K(□0.5Na0.5)2Mg2Be3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Klöchite | (□Na)KFe2+2Zn3(Si12O30) | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
Merrihueite | (K,Na)2(Fe,Mg)5Si12O30 | Hex. |
Milarite | K2Ca4Al2Be4Si24O60 · H2O | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Oftedalite | K(Sc,Ca,Mn2+)2◻2[(Be,Al)3Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Osumilite | (K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30 | Hex. |
Osumilite-(Mg) | KMg2Al3(Al2Si10)O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Poudretteite | KNa2B3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Roedderite | (Na,K)2(Mg,Fe)5Si12O30 | Hex. 6 m2 : P62c |
Shibkovite | K(□,K,Na)2Zn3Ca2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sogdianite | K(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sugilite | K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30] | Hex. |
Trattnerite | □(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30) | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
UM1990-73-SiO:KMnNaZn | (K,Na)2Zn3Mn1.5Si12O30 | Hex. |
Yagiite | (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 | Hex. 6/mmm (6/m 2/m 2/m) |
Forms a series with:
Common Associates
Related Minerals - Nickel-Strunz Grouping
9.CM.05 | Armenite | BaCa2Al6Si9O30 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pnna |
9.CM.05 | Brannockite | (K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Chayesite | KMg4Fe3+[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Darapiosite | K(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Merrihueite | (K,Na)2(Fe,Mg)5Si12O30 | Hex. |
9.CM.05 | Milarite | K2Ca4Al2Be4Si24O60 · H2O | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Osumilite-(Mg) | KMg2Al3(Al2Si10)O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Osumilite | (K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30 | Hex. |
9.CM.05 | Poudretteite | KNa2B3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Roedderite | (Na,K)2(Mg,Fe)5Si12O30 | Hex. 6 m2 : P62c |
9.CM.05 | Sogdianite | K(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Sugilite | K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30] | Hex. |
9.CM.05 | Yagiite | (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 | Hex. 6/mmm (6/m 2/m 2/m) |
9.CM.05 | Berezanskite | K□2Li3(Ti,Zr,Sn)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Dusmatovite | K(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Shibkovite | K(□,K,Na)2Zn3Ca2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Almarudite | K(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
9.CM.05 | Trattnerite | □(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30) | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.05 | Oftedalite | K(Sc,Ca,Mn2+)2◻2[(Be,Al)3Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.9.CM. | Aluminosugilite | KNa2Al2Li3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CM.10 | Faizievite | K2Na(Ca6Na)Ti4Li6[Si6O18]2[Si12O30]F2 | Tric. 1 : P1 |
Related Minerals - Dana Grouping (8th Ed.)
63.2.1a.1 | Brannockite | (K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.2 | Chayesite | KMg4Fe3+[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.3 | Darapiosite | K(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.5 | Merrihueite | (K,Na)2(Fe,Mg)5Si12O30 | Hex. |
63.2.1a.6 | Osumilite | (K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30 | Hex. |
63.2.1a.8 | Poudretteite | KNa2B3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.9 | Sugilite | K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30] | Hex. |
63.2.1a.10 | Yagiite | (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 | Hex. 6/mmm (6/m 2/m 2/m) |
63.2.1a.11 | Dusmatovite | K(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.12 | Milarite | K2Ca4Al2Be4Si24O60 · H2O | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.13 | Sogdianite | K(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
63.2.1a.14 | Roedderite | (Na,K)2(Mg,Fe)5Si12O30 | Hex. 6 m2 : P62c |
Related Minerals - Hey's Chemical Index of Minerals Grouping
14.4.1 | Forsterite | Mg2SiO4 | Orth. mmm (2/m 2/m 2/m) |
14.4.2 | Enstatite | Mg2Si2O6 | Orth. mmm (2/m 2/m 2/m) : Pbca |
14.4.3 | Clinoenstatite | MgSiO3 | Mon. 2/m : P21/b |
14.4.4 | Chrysotile | Mg3(Si2O5)(OH)4 | Mon. |
14.4.5 | Clinochrysotile | Mon. 2/m | |
14.4.6 | Orthochrysotile | Orth. | |
14.4.7 | Parachrysotile | Orth. | |
14.4.8 | Lizardite | Mg3(Si2O5)(OH)4 | |
14.4.9 | Talc | Mg3Si4O10(OH)2 | Tric. 1 : P1 |
14.4.10 | Spadaite | MgSiO2(OH)2 · H2O (?) | |
14.4.11 | Sepiolite | Mg4(Si6O15)(OH)2 · 6H2O | Orth. mmm (2/m 2/m 2/m) : Pnna |
14.4.12 | Loughlinite | Na2Mg3Si6O16 · 8H2O | Orth. |
14.4.14 | Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 | Mon. |
14.4.15 | Antigorite | Mg3(Si2O5)(OH)4 | Mon. m : Bm |
14.4.16 | Magnesio-anthophyllite | ☐{Mg2}{Mg5}(Si8O22)(OH)2 |
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.
References for Eifelite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
mindat.org URL:
https://www.mindat.org/min-1359.html
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Localities for Eifelite
Locality List




All localities listed without proper references should be considered as questionable.
Germany | |
| Günter Blaß (2014) Neuigkeiten aus der Vulkaneifel. Mineralienwelt 5/2014: 71 |
| 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. |
Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany