Clinokurchatovite Mineral Data

General Clinokurchatovite Information

Chemical Formula:

Ca(Mg,Fe++,Mn)B2O5

Composition:

Molecular Weight = 178.53 gm

Calcium 22.45 % Ca 31.41 % CaO

Magnesium 8.17 % Mg 13.55 % MgO

Manganese 3.08 % Mn 3.97 % MnO

Iron 9.38 % Fe 12.07 % FeO

Boron 12.11 % B 39.00 % B₂O₃

Oxygen 44.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg_0.6Fe²⁺_0.3Mn²⁺_0.1B₂O₅

Environment:

Replacement of kurchatovite in boron-bearing rocks.

IMA Status:

Approved IMA 1983

Locality:

Sayak-IV boron deposit, northeast Balkhash region, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named as the monoclinic dimorph of kurchatovite.

Synonym:

ICSD 23013

PDF 36-389

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Clinokurchatovite Crystallography

Axial Ratios:

a:b:c =1.1132:1:0.5105

Cell Dimensions:

a = 12.19, b = 10.95, c = 5.59, Z = 8; beta = 102° V = 729.85 Den(Calc)= 3.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/b

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

By Intensity(I/I_o): 2.799(1), 3.045(1), 3.093(0.8),

Crystal Structure:

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Callegari A , Mazzi F , Tadini C , European Journal of Mineralogy , 15 (2003) p.277-282, Modular aspects of the crystal structures of kurchatovite and clinokurchatovite, Locality: Sayak, Kazackhstan

Physical Properties of Clinokurchatovite

Color:

Light gray.

Density:

3.07 - 3.08, Average = 3.07

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

gray white

Optical Properties of Clinokurchatovite

Gladstone-Dale:

CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2189,KC= 0.2074
Ncalc = 1.64 - 1.67

Optical Data:

Biaxial (-), a=1.642-1.644, b=1.674-1.675, g=1.699-1.704, bire=0.0570-0.0600, 2V(Calc)=80-86, 2V(Meas)=82-88.

Calculated Properties of Clinokurchatovite

Electron Density:

Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Clinokurchatovite =3.25 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Clinokurchatovite}= 6.67 barns/electron
U=PE_{Clinokurchatovite} x rElectron Density= 21.24 barns/cc.

Radioactivity:

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

Clinokurchatovite Classification

Dana Class:

24.04.03.01 (24)Borates - Anhydrous

(24.04)where (A)2 (X2O5)

(24.04.03)Dana Group

24.04.03.01 Clinokurchatovite Ca(Mg,Fe,Mn)B2O5 P 2₁/b 2/m

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 Clinokurchatovite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Clinokurchatovite :
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

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

Clinokurchatovite

Ca(Mg,Fe++,Mn)B2O5
Dana No: 24.04.03.01 Strunz No: 06.BA.10
Locality:

Notes: