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Takéuchiite
A valid IMA mineral species
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About Takéuchiite
Yoshio Takéuchi
Formula:
(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
6
Specific Gravity:
3.93 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of Yoshio Takéuchi (20 January 1924, Tokyo, Japan - 5 July 2009, Tokyo, Japan), professor, University of Tokyo, who predicted the existance of a compound with a structure found in this mineral, and made major contributions to solving the structures of the pinakiolite group of minerals.
This page provides mineralogical data about Takéuchiite.
Name Encoding
ASCII-7:
Takeuchiite
Unique Identifiers
Mindat ID:
3873
Long-form identifier:
mindat:1:1:3873:3
IMA Classification of Takéuchiite
Approved
IMA Formula:
Mg2Mn3+O2BO3
Approval year:
1980
First published:
1980
Classification of Takéuchiite
6.AB.40
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
24.2.6.1
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
9.7.8
9 : Borates
7 : Borates of Mn
9 : Borates
7 : Borates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tké | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Takéuchiite
Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Brown
Hardness:
6 on Mohs scale
Fracture:
Irregular/Uneven
Density:
3.93 g/cm3 (Calculated)
Optical Data of Takéuchiite
Type:
Biaxial
Chemistry of Takéuchiite
Mindat Formula:
(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2
Element Weights:
Crystallography of Takéuchiite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnnm
Setting:
Pnnm
Cell Parameters:
a = 27.585(4) Å, b = 12.561(3) Å, c = 6.027(2) Å
Ratio:
a:b:c = 2.196 : 1 : 0.48
Unit Cell V:
2,088.33 ų (Calculated from Unit Cell)
Z:
24
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.511 Å | (100) |
| 2.60 Å | (90) |
| 5.20 Å | (85) |
| 2.035 Å | (80) |
| 2.73 Å | (70) |
| 2.209 Å | (70) |
| 3.02 Å | (65) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Takéuchiite
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden; National Museum of Natural History, Washington, D.C., USA, 138548.
Associated Minerals at Type Locality:
Synonyms of Takéuchiite
Other Language Names for Takéuchiite
Relationship of Takéuchiite to other Species
Member of:
Other Members of Orthopinakiolite Group:
| Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. mmm(2/m2/m2/m) : Pnnm |
| Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 | Orth. mmm(2/m2/m2/m) |
| Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. mmm(2/m2/m2/m) : Pnnm |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 6.AB. | Chubarovite | KZn2(BO3)Cl2 |
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) |
| 6.AB.10 | Berborite | Be2(BO3)(OH) · H2O |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) |
| 6.AB.30 | Fredrikssonite | Mg2Mn3+O2(BO3) |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
| 6.AB.45 | Hulsite | Fe2+2Fe3+O2(BO3) |
| 6.AB.45 | Magnesiohulsite | Mg2Fe3+O2(BO3) |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Takéuchiite
mindat.org URL:
https://www.mindat.org/min-3873.html
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References for Takéuchiite
Reference List:
Bovin, Jan-Olov, O'Keefe, M. (1980) Takéuchiite, a new oxyborate mineral from Långban, Sweden. American Mineralogist, 65 (11-12) 1130-1133
Bovin, J.-O., O'Keeffe, M., O'Keefe, M. A. (1981) Electron microscopy of oxyborates. I. Defect structures in the minerals pinakiolite, ludwigite, orthopinakiolite and takéuchiite. Acta Crystallographica Section A, 37 (1) 28-35 doi:10.1107/s0567739481000065
Dunn, Pete J., Chao, George Y., Fitzpatrick, Joan J., Langley, Richard H., Fleischer, Michael, Zilczer, Janet A. (1986) New Mineral Names. American Mineralogist, 71 (1-2). 227-232
Localities for Takéuchiite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Bovin et al. (1980) +1 other reference |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden