Takeuchiite Mineral Data + 
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Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows
- 24.2.6.1 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m
- 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
General Takeuchiite Information |
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 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 | |||
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Images:
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Takeuchiite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 1.511(1), 2.6(0.9), 5.2(0.85), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Takeuchiite |
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| 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 |
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| 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 |
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Calculated Properties of Takeuchiite |
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| Electron Density: |
relectron=3.57 gm/cc |
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| Fermion Index |
Fermion Index = 0.03627 Boson Index = 0.96373 |
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| Photoelectric: |
PETakeuchiite = 7.85 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Takeuchiite is Not Radioactive |
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Takeuchiite Classification |
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| Dana Class: |
24.2.6.1 (24)Borates - Anhydrous | ||
| (24.2)where (A)2 BO2 [XO3] | |||
| (24.2.6)Dana Group | |||
| Strunz Class: |
V/G.04-70 V - Nitrates, Carbonates and Borates | ||
| V/G - "Insel" borates [BO3]3- "inseln" | |||
| V/G.04 - Ludwigite group | |||
Other Takeuchiite Information |
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| 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Scandinavian mineral gallery 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Takeuchiite using: Visit our Advertisers for Takeuchiite : Translate Takeuchiite Mineral Data : Ask about Takeuchiite here : Print or Cut-and-Paste your Takeuchiite Specimen Label here :
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