Belkovite
A valid IMA mineral species
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About Belkovite
Igor V. Belkov
Formula:
Ba3(Nb,Ti)6(Si2O7)2O12
Colour:
Brown
Lustre:
Adamantine
Hardness:
6 - 7
Specific Gravity:
4.16
Crystal System:
Hexagonal
Name:
Named in honor of Igor Vladimirovich Belkov (Игорь Владимирович Белков) (13 August 1917, Tashkent, Uzbekistan - 18 November 1989, Apatity, Russia), mineralogist, Director, Kola Scientific Center, Apatity, Russia, who explored the Kola Peninsula.
This page provides mineralogical data about Belkovite.
Unique Identifiers
Mindat ID:
609
Long-form identifier:
mindat:1:1:609:1
Similar Names
| Belovite | A synonym | |
| Belovite (of Nefedov) | A synonym of Talmessite | |
| Belovite-(Ce) | A valid IMA mineral species - grandfathered | NaCeSr3(PO4)3F |
| Belovite-(La) | A valid IMA mineral species | NaLaSr3(PO4)3F |
| Melkovite | A valid IMA mineral species | [Ca2(H2O)15Ca(H2O)6][Mo8P2Fe33+O36(OH)] |
IMA Classification of Belkovite
Approved
IMA Formula:
Ba3Nb5+6(Si2O7)2O12
Approval year:
1989
First published:
1991
Classification of Belkovite
9.BE.75
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
17.8.11
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Bkv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Belkovite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Belkovite
Adamantine
Transparency:
Transparent
Colour:
Brown
Streak:
White
Hardness:
6 - 7 on Mohs scale
Hardness:
VHN40=900 - 1030 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
4.16(3) g/cm3 (Measured) 4.25 g/cm3 (Calculated)
Comment:
Calculated from empirical formula
Optical Data of Belkovite
Type:
Uniaxial (+)
RI values:
nω = 1.928(2) nε = 2.002(5)
Max. Birefringence:
δ = 0.074
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Comments:
anomalously biaxial.
Chemistry of Belkovite
Mindat Formula:
Ba3(Nb,Ti)6(Si2O7)2O12
Element Weights:
Common Impurities:
Zr,Al,Fe,Ta,Ca,Na,K
Crystallography of Belkovite
Crystal System:
Hexagonal
Class (H-M):
6m2 - Ditrigonal Dipyramidal
Space Group:
P62m
Cell Parameters:
a = 8.966(3) Å, c = 7.799(3) Å
Ratio:
a:c = 1 : 0.87
Unit Cell V:
542.96 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014242 | Belkovite | Choisnet J, Nguyen N, Groult D, Raveau B (1976) De nouveaux oxydes a reseau forme d'octahedres NbO6 (TaO6) et de groupes Si2O7: Les phases A3Ta6Si4O26 (A = Ba,Sr) et K6M6Si4O26 (M = Nb,Ta) Materials Research Bulletin 11 887-894 | 1976 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.81 Å | (35 |
| 3.888 Å | (51) |
| 3.481 Å | (24) |
| 2.937 Å | (100) |
| 2.750 Å | (25) |
| 1.948 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Belkovite
General Appearance of Type Material:
Thin rims on barian pyrochlore and as barrel-shaped crystals up to 1.0 mm.
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, Russia, 2036/1.
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 6014.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p584.
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 6014.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p584.
Geological Setting of Type Material:
Dolomite-calcite carbonatites.
Associated Minerals at Type Locality:
Synonyms of Belkovite
Other Language Names for Belkovite
Common Associates
Associations Based on Photo Data:
| 1 photo of Belkovite associated with Dolomite | CaMg(CO3)2 |
| 1 photo of Belkovite associated with Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Related Minerals - Strunz-mindat Grouping
| 9.BE. | Zinkgruvanite | Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2 |
| 9.BE. | Calciomurmanite | (Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4 |
| 9.BE. | Cámaraite | Ba3Na(Fe2+,Mn)8Ti4(Si2O7)4O4(OH,F)7 |
| 9.BE. | Alfredcasparite | Sr2TiO(Si2O7) |
| 9.BE. | Batievaite-(Y) | Y2Ca2Ti(Si2O7)2(OH)2(H2O)4 |
| 9.BE. | Nacareniobsite-(Y) | Na3Ca3YNb(Si2O7)2OF3 |
| 9.BE. | Alexkuznetsovite-(Ce) | Ce2Mn(CO3)(Si2O7) |
| 9.BE. | Bobshannonite | Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2 |
| 9.BE. | Paralomonosovite | Na6◻4Ti4(Si2O7)2[PO3OH][PO2(OH)2]O2(OF) |
| 9.BE. | Madeiraite | Na2Ca2Fe2Zr2(Si2O7)2O2F2 |
| 9.BE. | Bortolanite | Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2 |
| 9.BE. | Longshoushanite-(Ce) | Ce4MgAl2Ti2(Si2O7)2O8 |
| 9.BE. | Moxuanxueite | NaCa6Zr(Si2O7)2OF3 |
| 9.BE. | Delhuyarite-(Ce) | Ce4Mg(Fe3+,W)3◻(Si2O7)2O6(OH)2 |
| 9.BE. | Christofschäferite-(Ce) | Ce3CaMnTiFe3+Ti2(Si2O7)2O8 |
| 9.BE.X | Asimowite | Fe2+4O(Si2O7) |
| 9.BE. | Biraite-(La) | La2Fe2+(CO3)(Si2O7) |
| 9.BE. | Pilanesbergite | Na2Ca2Fe2Ti2(Si2O7)2O2F2 |
| 9.BE.02 | Wadsleyite | Mg4O(Si2O7) |
| 9.BE.02 | Ohtaniite | Mg3(Si0.5◻0.5)Si2O8 |
| 9.BE.05 | Lawsonite | CaAl2(Si2O7)(OH)2 · H2O |
| 9.BE.05 | Hennomartinite | SrMn3+2(Si2O7)(OH)2 · H2O |
| 9.BE.05 | Cortesognoite | CaV2(Si2O7)(OH)2 · H2O |
| 9.BE.05 | Noelbensonite | BaMn3+2(Si2O7)(OH)2 · H2O |
| 9.BE.05 | Itoigawaite | SrAl2(Si2O7)(OH)2 · H2O |
| 9.BE.07 | Ilvaite | CaFe3+Fe2+2(Si2O7)O(OH) |
| 9.BE.07 | Amamoorite | CaMn2+2Mn3+(Si2O7)O(OH) |
| 9.BE.07 | Manganilvaite | CaFe2+Fe3+Mn2+(Si2O7)O(OH) |
| 9.BE.10 | Suolunite | Ca2(H2Si2O7) · H2O |
| 9.BE.12 | Jaffeite | Ca6(Si2O7)(OH)6 |
| 9.BE.15 | Fresnoite | Ba2Ti(Si2O7)O |
| 9.BE.17 | Janhaugite | (Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2 |
| 9.BE.17 | Burpalite | Na2CaZr(Si2O7)F2 |
| 9.BE.17 | Niocalite | (Ca,Nb)4(Si2O7)(O,OH,F)2 |
| 9.BE.17 | Normandite | NaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OF |
| 9.BE.17 | Hiortdahlite | Na2Ca4(Ca0.5Zr0.5)Zr(Si2O7)2OF3 |
| 9.BE.17 | Låvenite | Na2Ca2Mn2Zr2(Si2O7)2O2F2 |
| 9.BE.17 | Cuspidine | Ca8(Si2O7)2F4 |
| 9.BE.17 | Wöhlerite | Na2Ca4ZrNb(Si2O7)2O3F |
| 9.BE.17 | Baghdadite | Ca6Zr2(Si2O7)2O4 |
| 9.BE.20 | Nacareniobsite-(Ce) | Na3Ca3(Ce,REE)Nb(Si2O7)2OF3 |
| 9.BE.20 | Roumaite | (Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3 |
| 9.BE.20 | Rinkite-(Ce) | (Ca3Ce)Na(NaCa)Ti(Si2O7)2(OF)F2 |
| 9.BE.20 | Nacareniobsite-(Nd) | Ca2(CaNd)Na3Nb(Si2O7)2(OF)F2 |
| 9.BE.20 | Rinkite-(Y) | Na2Ca4YTi(Si2O7)2OF3 |
| 9.BE.20 | Mosandrite-(Ce) | (Ca3REE)[(H2O)2Ca0.5◻0.5]Ti(Si2O7)2(OH)2(H2O)2 |
| 9.BE.22 | Hainite-(Y) | Na2Ca4(Y,REE)Ti(Si2O7)2OF3 |
| 9.BE.22 | Rosenbuschite | Na6Ca6Zr3Ti(Si2O7)4O2F6 |
| 9.BE.22 | Götzenite | NaCa6Ti(Si2O7)2OF3 |
| 9.BE.22 | Fogoite-(Y) | Na3Ca2Y2Ti(Si2O7)2OF3 |
| 9.BE.22 | Kochite | Na3Ca2MnZrTi(Si2O7)2OF3 |
| 9.BE.23 | Dovyrenite | Ca6Zr(Si2O7)2(OH)4 |
| 9.BE.25 | Lamprophyllite | (Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2 |
| 9.BE.25 | Seidozerite | Na4MnZr2Ti(Si2O7)2O2F2 |
| 9.BE.25 | Nabalamprophyllite | (BaNa)Ti2Na3Ti(Si2O7)2O2(OH)2 |
| 9.BE.25 | Schüllerite | Ba2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4 |
| 9.BE.25 | Ericssonite | BaMn2+2Fe3+(Si2O7)O(OH) |
| 9.BE.25 | Grenmarite | Na4MnZr3(Si2O7)2O2F2 |
| 9.BE.25 | Kazanskyite | BaNa3Ti2Nb(Si2O7)2O2(OH)2(H2O)4 |
| 9.BE.25 | Saamite | Ba◻Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2 |
| 9.BE.25 | Emmerichite | Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2 |
| 9.BE.25 | Barytolamprophyllite | (Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F) |
| 9.BE.25 | 'Ericssonite-2O' | BaMn2+2Fe3+(Si2O7)O(OH) |
| 9.BE.25 | Fluorbarytolamprophyllite | (Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2] |
| 9.BE.25 | Fluorlamprophyllite | Na3(SrNa)Ti3(Si2O7)2O2F2 |
| 9.BE.25 | Lileyite | Ba2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2 |
| 9.BE.27 | Kolskyite | CaNa2Ti4(Si2O7)2O4(H2O)7 |
| 9.BE.27 | Vigrishinite | NaZnTi4(Si2O7)2O3(OH)(H2O)4 |
| 9.BE.27 | Selivanovaite | NaFe3+Ti4(Si2O7)2O4(H2O)4 |
| 9.BE.27 | Murmanite | Na2Ti2(Si2O7)O2 · 2H2O |
| 9.BE.30 | Epistolite | (Na◻)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4 |
| 9.BE.32 | Lomonosovite | Na5Ti2(Si2O7)(PO4)O2 |
| 9.BE.35 | Vuonnemite | Na11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH) |
| 9.BE.37 | Sobolevite | Na13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3 |
| 9.BE.40 | Ferroinnelite | Ba4Ti2Na(NaFe2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)] |
| 9.BE.40 | Phosphoinnelite | Na3Ba4Ti3(Si2O7)2(PO4,SO4)2O2F |
| 9.BE.40 | Innelite | Ba4Ti2Na(NaMn2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)] |
| 9.BE.42 | Yoshimuraite | Ba2Mn2Ti(Si2O7)(PO4)O(OH) |
| 9.BE.42 | Horiite | Ba2Mn2Mn4Ti2(Si2O7)2(PO4)2O2(OH)2 |
| 9.BE.45 | Quadruphite | Na6Na2(CaNa)2Na2Ti2Na2Ti2(Si2O7)2(PO4)4O4F2 |
| 9.BE.47 | Polyphite | Na5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2 |
| 9.BE.50 | Shkatulkalite | Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3 |
| 9.BE.50 | Bornemanite | Na6BaTi2Nb(Si2O7)2(PO4)O2(OH)F |
| 9.BE.55 | Hejtmanite | Ba2Mn2+4Ti2(Si2O7)2O2(OH)2F2 |
| 9.BE.55 | Bykovaite | (Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2O |
| 9.BE.55 | Nechelyustovite | (Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2O |
| 9.BE.55 | Bafertisite | Ba2Fe2+4Ti2(Si2O7)2O2(OH)2F2 |
| 9.BE.60 | Delindeite | (Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2O |
| 9.BE.62 | 'Orthochevkinite' | (Ce,La,Ca,Na,Th)4(Fe2+,Mg)2(Ti,Fe3+)3Si4O22 |
| 9.BE.62 va | 'Strontium Perrierite' | (Ce,Sr,La,Ca)4Fe2+(Ti,Zr,Fe)2Ti2(Si2O7)2O8 |
| 9.BE.62 | 'Chevkinite-(Nd)' | (Nd,REE)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8 ? |
| 9.BE.62 | 'Perrierite-(Nd)' | Nd4MgFe3+2Ti2(Si2O7)2O8 ? |
| 9.BE.65 | Bussenite | Na2Ba2Fe2+Ti(Si2O7)(CO3)(OH)3F |
| 9.BE.67 | Jinshajiangite | BaNaFe2+4Ti2(Si2O7)2O2(OH)2F |
| 9.BE.67 | Perraultite | BaNaMn2+4Ti2(Si2O7)2O2(OH)2F |
| 9.BE.70 | Dingdaohengite-(Ce) | (Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe3+)2Ti2(Si2O7)2O8 |
| 9.BE.70 | Perrierite-(Ce) | Ce4MgFe3+2Ti2(Si2O7)2O8 |
| 9.BE.70 | Karnasurtite-(Ce) | (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O |
| 9.BE.70 | Maoniupingite-(Ce) | (Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8 |
| 9.BE.70 | Matsubaraite | Sr4Ti5(Si2O7)2O8 |
| 9.BE.70 | Rengeite | Sr4ZrTi4(Si2O7)2O8 |
| 9.BE.70 | Polyakovite-(Ce) | (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8 |
| 9.BE.70 | Hezuolinite | (Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8 |
| 9.BE.70 | 'UM2008-53-SiO:SrTiZr' | Sr4ZrTi4(Si2O7)2O8 |
| 9.BE.70 | Chevkinite-(Ce) | Ce4(Ti,Fe2+,Fe3+)5O8(Si2O7)2 |
| 9.BE.70 | Perrierite-(La) | (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4[(Si2O7)O4]2 |
| 9.BE.70 | Strontiochevkinite | (Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8 |
| 9.BE.72 | Fersmanite | Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 |
| 9.BE.77 | Nasonite | Pb6Ca4(Si2O7)3Cl2 |
| 9.BE.80 | Melanotekite | Pb2Fe3+2(Si2O7)O2 |
| 9.BE.80 | Kentrolite | Pb2Mn3+2(Si2O7)O2 |
| 9.BE.82 | Alexkuznetsovite-(La) | La2Mn(CO3)(Si2O7) |
| 9.BE.82 | Tilleyite | Ca5(Si2O7)(CO3)2 |
| 9.BE.85 | Killalaite | Ca6.4(H0.6Si2O7)2(OH)2 |
| 9.BE.87 | Stavelotite-(La) | (La,Nd,Ca)3Mn2+3Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30 |
| 9.BE.90 | Magnesiorowlandite-(Y) | Y4(Mg,Fe)(Si2O7)2F2 |
| 9.BE.90 | Biraite-(Ce) | Ce2Fe2+(Si2O7)(CO3) |
| 9.BE.92 | Cervandonite-(Ce) | (Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH) |
| 9.BE.92 | Chirvinskyite | (Na,Ca)13(Fe,Mn,◻)2(Ti,Zr)5(Si2O7)4(OH,O)12 · 2H2O |
| 9.BE.95 | Rusinovite | Ca10(Si2O7)3Cl2 |
| 9.BE.95 | Batisivite | BaV3+8Ti6(Si2O7)O22 |
| 9.BE.97 | Schlüterite-(Y) | (Y,REE)2AlSi2O7(OH)2F |
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.
Internet Links for Belkovite
mindat.org URL:
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References for Belkovite
Reference List:
Jambor, John L., Puziewicz, Jacek (1991) New Mineral Names. American Mineralogist, 76 (9-10) 1728-1735
Dey, Monojit, Bhattacharjee, Sourav, Chakrabarty, Aniket, Mitchell, Roger H., Pal, Supriyo, Pal, Supratim, Sen, Amit Kumar (2021) Compositional variation and genesis of pyrochlore, belkovite and baotite from the Sevattur carbonatite complex, India. Mineralogical Magazine, 85 (4) 588-606 doi:10.1180/mgm.2021.37
Localities for Belkovite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
India | |
| Dey et al. (2021) |
Russia | |
| Koneva A.A. et al. (2010) |
| Mills et al. (2012) | |
| Sorokhtina et al. (2008) |
| Voloshin et al. (1991) +1 other reference |
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Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia