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Komkovite

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Formula:
BaZr[Si3O9] · 3H2O
Colour:
Brown
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.31
Crystal System:
Trigonal
Name:
Named in honor of Aleksandr Ivanovich Komkov (Александра Ивановича Комкова) (1926-1987), mineralogist and crystallographer at the Karpinskii All-Union Research Institute of Geology, St. Petersburg, Russia.
This page provides mineralogical data about Komkovite.


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Classification of KomkoviteHide

Approved
First Published:
1990
9.DM.10

9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
59.2.4.1

59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
14.10.31

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Physical Properties of KomkoviteHide

Vitreous
Transparency:
Translucent
Colour:
Brown
Streak:
Light brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Density:
3.31 g/cm3 (Measured)    3.31 g/cm3 (Calculated)

Optical Data of KomkoviteHide

Type:
Uniaxial (-)
RI values:
nω = 1.671 nε = 1.644
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of KomkoviteHide

Formula:
BaZr[Si3O9] · 3H2O
IMA Formula:
BaZrSi3O9 · 3H2O
Common Impurities:
Hf,Fe,Ca,K

Crystallography of KomkoviteHide

Crystal System:
Trigonal
Cell Parameters:
a = 10.52 Å, c = 15.73 Å
Ratio:
a:c = 1 : 1.495
Unit Cell V:
1,507.62 ų (Calculated from Unit Cell)

Type Occurrence of KomkoviteHide

Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity.
Mining Institute, St. Petersburg, 2037/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p462/1.
Reference:
Voloshin, A.V., Pakhomovskiy, Y.Y., Men'shikov, Y.P., Sokolova, Y.V., Yegorov-Tismenko, Y.K. (1990) Komkovite - A new hydrous barium zirconosilicate from the carbonatites of Vuoriyarvi (Kola Peninsula). Mineralogiceskij Zhurnal: 12: 69-73.

Synonyms of KomkoviteHide

Other Language Names for KomkoviteHide

German:Komkovit
Spanish:Komkovita

Related Minerals - Nickel-Strunz GroupingHide

9.DM.05StokesiteCaSn[Si3O9] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2O
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2OTrig.
9.DM.15GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
9.DM.15GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
9.DM.20ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
9.DM.25VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
9.DM.30RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
9.DM.35ScheuchzeriteNa(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3Tric. 1 : P1
9.DM.40TerskiteNa4ZrSi6O16 · 2H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.10.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.3ZektzeriteLiNaZrSi6O15Orth.
14.10.4ParakeldyshiteNa2ZrSi2O7Tric.
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
14.10.6Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
14.10.8TerskiteNa4ZrSi6O16 · 2H2OOrth.
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
14.10.11PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
14.10.12KhibinskiteK2ZrSi2O7Mon.
14.10.13WadeiteK2Zr(Si3O9)Hex.
14.10.14DalyiteK2ZrSi6O15Tric.
14.10.15KostyleviteK2Zr(Si3O9) · H2OMon.
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
14.10.18GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
14.10.19GittinsiteCaZrSi2O7Mon.
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2O
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2OMon.
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
14.10.25BaghdaditeCa3(Zr,Ti)(Si2O7)O2Mon.
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
14.10.29DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.10.30BaziriteBaZr(Si3O9)Hex.
14.10.32ZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
14.10.33Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Other InformationHide

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 KomkoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Voloshin, A.V., Pakhomovskiy, Y.Y., Men'shikov, Y.P., Sokolova, Y.V., Yegorov-Tismenko, Y.K. (1990) Komkovite - A new hydrous barium zirconosilicate from the carbonatites of Vuoriyarvi (Kola Peninsula). Mineralogiceskij Zhurnal: 12: 69-73.
Sokolova, E.V., Arakcheeva, A.V., Voloshin, A.V. (1991) Crystal structure of komkovite. Soviet Physics - Doklady: 36: 666-668.
Jambor, J.L., Grew, E.S. (1992) New mineral names. American Mineralogist: 77: 207-213.
Jambor, J.L., Puziewicz, J. (1993) New mineral names. American Mineralogist: 78: 450-455.
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1993): 122: 76.
New Minerals (1997), New Minerals 1990-1994.
Doklady Akademii Nauk SSSR: 320(6): 1384-1388.

Internet Links for KomkoviteHide

Localities for KomkoviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Northern Karelia
Mineral. Zhurnal (1990) 12 (3), 69-73 ; Amer. Mineral. (1992) 77, 207-208; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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