Shibkovite
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About Shibkovite
Formula:
K(□,K,Na)2Zn3Ca2[Si12O30]
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
5½ - 6
Crystal System:
Hexagonal
Member of:
Name:
Named after two prominent Russian geologists, Viktor Sergeevitch Shibkov (Виктора Сергеевича Шибкова) (1926-1992) and Nikolai Viktorovitch Shibkov (Николая Викторовича Шибкова) (1951-1991), who both spent their professional lives working on the geology of Soviet Asia.
Classification of Shibkovite
Approved
8/E.22-133
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)
Physical Properties of Shibkovite
Optical Data of Shibkovite
Type:
Uniaxial (+)
RI values:
nω = 1.561 nε = 1.563
Max Birefringence:
δ = 0.002

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 Shibkovite
Formula:
K(□,K,Na)2Zn3Ca2[Si12O30]
IMA Formula:
K2Ca2(Zn3Si12)O30
Idealised Formula:
K(□K)Zn3Ca2[Si12O30]
Crystallography of Shibkovite
Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Cell Parameters:
a = 10.505 Å, c = 14.185 Å
Ratio:
a:c = 1 : 1.35
Unit Cell V:
1,355.66 ų (Calculated from Unit Cell)
Z:
2
Type Occurrence of Shibkovite
Synonyms of Shibkovite
Other Language Names for Shibkovite
Relationship of Shibkovite 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 |
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 |
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 |
Eifelite | KNa3Mg4Si12O30 | Hex. |
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 |
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. |
Unnamed (Al-dominant analog of Sugilite) | K(Na,□)2Li3(Al,Mn,Fe)2[Si12O30] | |
Yagiite | (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 | Hex. 6/mmm (6/m 2/m 2/m) |
Common Associates
Associated Minerals Based on Photo Data:
Pyrochlore Group | 3 photos of Shibkovite associated with Pyrochlore Group on mindat.org. |
Quartz | 3 photos of Shibkovite associated with Quartz on mindat.org. |
Reedmergnerite | 2 photos of Shibkovite associated with Reedmergnerite on mindat.org. |
Telyushenkoite | 2 photos of Shibkovite associated with Telyushenkoite on mindat.org. |
Polylithionite | 1 photo of Shibkovite associated with Polylithionite on mindat.org. |
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 | K(Mg,Fe)4FeSi12O30 | 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 | Eifelite | KNa3Mg4Si12O30 | Hex. |
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 | 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.10 | Faizievite | K2Na(Ca6Na)Ti4Li6[F2|Si24O66] | Tric. 1 : P1 |
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 Shibkovite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1998): 127(4): 89-94.
Internet Links for Shibkovite
mindat.org URL:
https://www.mindat.org/min-7290.html
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Localities for Shibkovite
Locality List




All localities listed without proper references should be considered as questionable.
Tajikistan (TL) | |
| http://www.koeln.netsurf.de/~w.steffens/dara.htm; Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian). |
Dara-i-Pioz Glacier, Alai Range, Tien Shan Mtn, Districts of Republican Subordination, Tajikistan