Takéuchiite
A valid IMA mineral species
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About Takéuchiite
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.
Unique Identifiers
Mindat ID:
3873
Long-form identifier:
mindat:1:1:3873:3
GUID
(UUID V4):
(UUID V4):
5a91949b-c47b-4a39-885d-f58b16ab001f
IMA Classification of Takéuchiite
Approved
IMA Formula:
Mg2Mn3+O2(BO3)
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 |
---|---|---|
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
Crystallography of Takéuchiite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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-𝑇 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:
Reference:
Bovin, J.O., O’Keeffe, M. (1980) Takéuchiite, a new oxyborate mineral from Långban, Sweden. American Mineralogist: 65: 1130-1133.
Synonyms of Takéuchiite
Other Language Names for Takéuchiite
Relationship of Takéuchiite to other Species
Member of:
Other Members of this group:
Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 | Orth. mmm (2/m 2/m 2/m) |
Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
Common Associates
Related Minerals - Strunz-mindat Grouping
6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
6.AB. | Chubarovite | KZn2(BO3)Cl2 |
6.AB. | Savelievaite | Mg2Cr3+O2(BO3) |
6.AB.05 | Hambergite | Be2(BO3)(OH) |
6.AB.10 | Berborite | Be2(BO3)(OH,F) · H2O |
6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 |
6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
6.AB.45 | Hulsite | (Fe2+,Mg)2(Fe3+,Sn)(BO3)O2 |
6.AB.45 | Magnesiohulsite | (Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2 |
6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
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 | Painite | CaZrAl9(BO3)O15 |
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.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
Localities for Takéuchiite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Bovin et al. (1980) +1 other reference |
Quick NavTopAbout TakéuchiiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden