Belkovite Mineral Data

General Belkovite Information

Chemical Formula:

Ba3(Nb,Ti)6(Si2O7)2O12

Composition:

Molecular Weight = 1,407.69 gm

Barium 29.27 % Ba 32.68 % BaO

Titanium 6.80 % Ti 11.35 % TiO₂

Niobium 26.40 % Nb 37.77 % Nb₂O₅

Silicon 7.98 % Si 17.07 % SiO₂

Oxygen 29.55 % O

______ ______

100.00 % 98.86 % = TOTAL OXIDE

Empirical Formula:

Ba₃Nb₄Ti₂2(Si₂O₇)O₁₂

Environment:

Of secondary origin, formed by the alteration of barium-rich pyrochlore during dolomitization of calcite carbonatites in pyroxenites.

IMA Status:

Approved IMA 1989 (Dana # Added)

Locality:

In the Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For I.V. Bel'kov (1917-1989), Soviet mineralogist who explored the Kola Peninsula, Russia.

Name Pronunciation:

Belkovite + Pronunciation

Synonym:

ICSD 39223

IMA1989-053

PDF 45-1404

Belkovite Image

Images:

Belkovite

Comments: Brown hypidiomorphic granular grains of belkovite in tonalite.
Location: Seblyavr Massif, Kola, Russia. Scale: Not Give - 2 cm?.
© Diederik Visser

Belkovite Crystallography

Axial Ratios:

a:c = 1:0.86694

Cell Dimensions:

a = 8.996, c = 7.799, Z = 1; V = 546.60 Den(Calc)= 4.28

Crystal System:

Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 62m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.937(1), 3.888(0.51), 7.81(0.35),

Physical Properties of Belkovite

Cleavage:

None

Color:

Brown.

Density:

4.16

Diaphaneity:

Transparent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Adamantine

Streak:

white

Optical Properties of Belkovite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2255,KPDmeas= 0.232,KC= 0.2231
Ncalc = 1.93 - 1.96

Optical Data:

Uniaxial (+), w=1.928, e=2.002, bire=0.0740.

Calculated Properties of Belkovite

Electron Density:

Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Belkovite =4.28 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Belkovite= 171.58 barns/electron
U=PE_Belkovite x rElectron Density= 667.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Belkovite is Not Radioactive

Belkovite Classification

Dana Class:

55.04.03.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.04)with cations in [8] and lower coordination

(55.04.03)Dana Group

55.04.03.01 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

Strunz Class:

09.BE.75 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.75 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

Other Belkovite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Belkovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Belkovite Specimen Label here :

Belkovite

Ba3(Nb,Ti)6(Si2O7)2O12
Dana No: 55.04.03.01 Strunz No: 09.BE.75
Locality:

Notes:

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