Takeuchiite Mineral Data

General Takeuchiite Information

Chemical Formula:

Mg2Mn+++O2(BO3)

Composition:

Molecular Weight = 194.36 gm

Magnesium 25.01 % Mg 41.48 % MgO

Manganese 28.27 % Mn 40.61 % Mn₂O₃

Boron 5.56 % B 17.91 % B₂O₃

Oxygen 41.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂Mn³⁺O₂(BO₃)

Environment:

In dolomite.

IMA Status:

Approved IMA 1980

Locality:

Lanban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Yoshio Takeuchi (1924-), Japanese mineralogist

Name Pronunciation:

Takeuchiite + Pronunciation

Takeuchiite Image

Images:

Takeuchiite

Comments: Aggregates of black prismatic takeuchiite crystals.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Takeuchiite Crystallography

Axial Ratios:

a:b:c =2.1801:1:0.4793

Cell Dimensions:

a = 27.5, b = 12.614, c = 6.046, Z = 24; V = 2,097.27 Den(Calc)= 3.69

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 1.511(1), 2.6(0.9), 5.2(0.85),

Crystal Structure:

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Norrestam R , Bovin J-O , Zeitschrift fur Kristallographie , 181 (1987) p.135-149, The crystal structure of takeuchiite, Mg1.71Mn1.29BO5:, A combined single crystal X-ray and HRTEM study, Locality: Langban mine, Sweden

Physical Properties of Takeuchiite

Cleavage:

None

Color:

Black.

Density:

3.93

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

6 - Orthoclase

Luster:

Metallic

Streak:

brown

Optical Properties of Takeuchiite

Optical Data:

NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.2437) where Ncalc=Dcalc*KC+1
NCalc= 1.96 - from Gladstone-Dale relationship (KC = 0.2437) where Ncalc=Dmeas*KC+1

Calculated Properties of Takeuchiite

Electron Density:

Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Takeuchiite =3.69 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Takeuchiite= 7.85 barns/electron
U=PE_Takeuchiite x rElectron Density= 28.02 barns/cc.

Radioactivity:

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

Takeuchiite Classification

Dana Class:

24.02.06.01 (24)Borates - Anhydrous

(24.02)where (A)2 BO2 [XO3]

(24.02.06)Dana Group

24.02.06.01 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

Strunz Class:

06.AB.40 06 - BORATES

06.A - Monoborates

06.AB -BO3, with additional anions; 1(D) + OH, etc.

06.AB.40 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m

06.AB.40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

06.AB.40 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

06.AB.40 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

Other Takeuchiite Information

References:

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

See Also:

Links to other databases for Takeuchiite :
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 - Scandinavian mineral gallery
16 - WWW-MINCRYST

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Ask about Takeuchiite here :
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Print or Cut-and-Paste your Takeuchiite Specimen Label here :

Takeuchiite

Mg2Mn+++O2(BO3)
Dana No: 24.02.06.01 Strunz No: 06.AB.40
Locality:

Notes: