Jimboite
A valid IMA mineral species
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About Jimboite
Kotora Jimbo
Formula:
(Mn2+,Mg)3[BO3]2
Colour:
Pale purplish brown
Lustre:
Vitreous
Hardness:
5½
Specific Gravity:
3.98 - 4.02
Crystal System:
Orthorhombic
Name:
Named by T. Watanabe, A. Kato, T. Matsumoto, and J. Ito in 1963 in honor of Prof. Kotora Jimbo (1867 - 1924), the founder of the Mineralogical Institute, University of Tokyo.
Type Locality:
This page provides mineralogical data about Jimboite.
Unique Identifiers
Mindat ID:
2095
Long-form identifier:
mindat:1:1:2095:0
IMA Classification of Jimboite
Approved
IMA Formula:
Mn2+3(BO3)2
Approval year:
1963
Classification of Jimboite
6.AA.35
6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
24.3.2.2
24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
9.7.3
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 |
|---|---|---|
| Jbo | 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 Jimboite
Vitreous
Transparency:
Translucent
Colour:
Pale purplish brown
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
{110}
{110}
Parting:
{101}
Density:
3.98 - 4.02 g/cm3 (Measured) 3.98 g/cm3 (Calculated)
Optical Data of Jimboite
Type:
Biaxial (+)
RI values:
nα = 1.792 nβ = 1.794 nγ = 1.821
2V:
Measured: 35° , Calculated: 32°
Max. Birefringence:
δ = 0.029
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v perceptible
Chemistry of Jimboite
Mindat Formula:
(Mn2+,Mg)3[BO3]2
Elements listed:
Common Impurities:
Mg
Crystallography of Jimboite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 5.638(5) Å, b = 8.714(3) Å, c = 4.633(7) Å
Ratio:
a:b:c = 0.647 : 1 : 0.532
Unit Cell V:
227.62 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Composition and twin plane {101}
Comment:
Space Group: P nmn
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010865 | Jimboite | Effenberger H, Pertlik F (1984) Verfeinerung der kristallstrukturen der isotypen verbindungen M3(BO3)2 mit M=Mg, Co und Ni (strukturtyp: kotoit) Zeitschrift fur Kristallographie 166 129-140 |  | 1984 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.33 Å | (100) |
| 2.77 Å | (90) |
| 4.09 Å | (70) |
| 1.580 Å | (70) |
| 3.59 Å | (60) |
| 2.59 Å | (50) |
| 1.791 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Jimboite
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, M15-112; The Natural History Museum, London, England.
Associated Minerals at Type Locality:
Synonyms of Jimboite
Other Language Names for Jimboite
Common Associates
Associations Based on Photo Data:
| 2 photos of Jimboite associated with Galaxite | Mn2+Al2O4 |
| 2 photos of Jimboite associated with Rhodochrosite | MnCO3 |
Related Minerals - Strunz-mindat Grouping
| 6.AA.05 | Sassolite | H3BO3 |
| 6.AA.15 | Nordenskiöldine | CaSn4+[BO3]2 |
| 6.AA.15 | Tusionite | Mn2+Sn4+[BO3]2 |
| 6.AA.35 | Kotoite | Mg3[BO3]2 |
| 6.AA.40 | Takedaite | Ca3[BO3]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 Jimboite
mindat.org URL:
https://www.mindat.org/min-2095.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Jimboite
Reference List:
Localities for Jimboite
Showing 5 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.
Japan | |
| National Science Museum (Tokyo) +1 other reference |
| Excalibur Mineral Co. and Kotaro ... +1 other reference |
| Akira Kato (undated manuscript) +2 other references |
Romania | |
| Marincea (2000) |
| Hirtopanu et al. (2015) |
Quick NavTopAbout JimboiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Rito mine, Seta, Midori City, Gunma Prefecture, Japan