Kurchatovite Mineral Data

General Kurchatovite Information

Chemical Formula:

Ca(Mg,Mn,Fe++)B2O5

Composition:

Molecular Weight = 178.34 gm

Calcium 22.47 % Ca 31.44 % CaO

Magnesium 8.18 % Mg 13.56 % MgO

Manganese 9.24 % Mn 11.93 % MnO

Iron 3.13 % Fe 4.03 % FeO

Boron 12.12 % B 39.04 % B₂O₃

Oxygen 44.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg_0.6Mn²⁺_0.3Fe²⁺_0.1B₂O₅

Environment:

Found in a skarn. Dimorphous with clinokurchatovite.

IMA Status:

Approved IMA 1966

Locality:

Solongo, Transbaikalia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Igor V. Kurchatov (1903-1960), Russian physicist.

Name Pronunciation:

Kurchatovite + Pronunciation

Synonym:

ICSD 200803

PDF 43-689

Kurchatovite Image

Images:

Kurchatovite

Comments: Gray crystalline kurchatovite (arrow) in matrix (distinguishable by violet fluorescence).
Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kurchatovite Crystallography

Axial Ratios:

a:b:c =0.3063:1:0.1524

Cell Dimensions:

a = 11.15, b = 36.4, c = 5.55, Z = 24; V = 2,252.52 Den(Calc)= 3.16

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.78(1), 1.922(0.9), 2.67(0.8),

Physical Properties of Kurchatovite

Cleavage:

{010} Perfect

Color:

Light gray.

Density:

3.02

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Fluorescent, Long UV=bright violet.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kurchatovite

Gladstone-Dale:

CI meas= -0.068 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2124,KPDmeas= 0.2223,KC= 0.2082
Ncalc = 1.63 - 1.66

Optical Data:

Biaxial (-), a=1.635, b=1.681, g=1.698, bire=0.0630, 2V(Calc)=60, 2V(Meas)=66. Dispersion r > v.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Kurchatovite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Kurchatovite =3.16 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Kurchatovite= 6.38 barns/electron
U=PE_Kurchatovite x rElectron Density= 19.73 barns/cc.

Radioactivity:

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

Kurchatovite Classification

Dana Class:

24.04.02.01 (24)Borates - Anhydrous

(24.04)where (A)2 (X2O5)

(24.04.02)Dana Group

24.04.02.01 Kurchatovite Ca(Mg,Mn,Fe)B2O5 P 2₁2₁2₁ 2 2 2

Strunz Class:

06.BA.10 06 - BORATES

06.B - Diborates

06.BA -Neso-diborates with double triangles B2(O,OH)5; 2(2D); 2(2D) + OH, etc.

06.BA.10 Clinokurchatovite Ca(Mg,Fe,Mn)B2O5 P 2₁/b 2/m

06.BA.10 Kurchatovite Ca(Mg,Mn,Fe)B2O5 P 2₁2₁2₁ 2 2 2

Other Kurchatovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Kurchatovite

Ca(Mg,Mn,Fe++)B2O5
Dana No: 24.04.02.01 Strunz No: 06.BA.10
Locality:

Notes:

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