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 % Nb2 O5
Silicon 7.98 % Si 17.07 % SiO2
Oxygen 29.55 % O
______ ______
100.00 % 98.86 % = TOTAL OXIDE
Empirical Formula:
Ba3 Nb4 Ti2 2(Si2 O7 )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 6 2m
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEBelkovite = 171.58 barns/electronU=PEBelkovite x r Electron 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 6 2m 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 6 2m 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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Belkovite
Ba3(Nb,Ti)6(Si2O7)2O12
Dana No: 55.04.03.01 Strunz No: 09.BE.75
Locality:
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