Takeuchiite Mineral Data

Takeuchiite Mineral Data +

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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

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

Diaphaniety:

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:

r_electron=3.57 gm/cc
note: r_Takeuchiite=3.69 gm/cc.

Fermion Index

Fermion Index = 0.03627
Boson Index = 0.96373

Photoelectric:

PE_Takeuchiite= 7.85 barns/electron
U=PE_Takeuchiite x r_electron= 28.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Takeuchiite is Not Radioactive

Takeuchiite Classification

Dana Class:

24.2.6.1 (24)Borates - Anhydrous

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

(24.2.6)Dana Group

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

Strunz Class:

V/G.04-70 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.04 - Ludwigite group

V/G.04-10 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-20 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

V/G.04-40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

V/G.04-50 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

V/G.04-60 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-70 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

V/G.04-80 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

V/G.04-90 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m

V/G.04-100 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 6₃ 6

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery
16 - WWW-MINCRYST

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Translate Takeuchiite Mineral Data :

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

Takeuchiite

Mg2Mn+++O2(BO3)
Dana No: 24.2.6.1 Strunz No: V/G.04-70
Locality:

Notes: