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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:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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