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Jimboite

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Rito mine, Gunma Prefecture, Kanto Region, Honshu Island, Japan
© 2008, JGW

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Formula:
(Mn
2+
 
,Mg)
 
3
[BO
 
3
]
 
2
System:OrthorhombicHardness:5½
This page provides mineralogical data about Jimboite.

Classification of Jimboite

IMA status:Approved 1963
Strunz 8th edition ID:5/G.01-20
Nickel-Strunz 10th (pending) edition ID:6.AA.35

6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
Dana 8th edition ID:24.3.2.2

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
Hey's CIM Ref.:9.7.3

9 : Borates
7 : Borates of Mn
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Type Occurrence of Jimboite

Type Locality:Kaso Mine, Kanuma, Tochigi Prefecture, Kanto Region, Honshu Island, Japan
Year of Discovery:1963

Physical Properties of Jimboite

Hardness (Mohs):5½

Crystallography of Jimboite

Crystal System:Orthorhombic
Cell Parameters:a = 5.66Å, b = 8.71Å, c = 4.65Å
Ratio:a:b:c = 0.65 : 1 : 0.534
Unit Cell Volume:V 229.24 ų (Calculated from Unit Cell)

Optical Data of Jimboite

Type:Biaxial (+)
RI values: nα = 1.792 nβ = 1.794 nγ = 1.821
2V:Measured: 30° , Calculated: 32°
Maximum Birefringence:δ = 0.029

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v perceptible

Chemical Properties of Jimboite

Formula:
(Mn
2+
 
,Mg)
 
3
[BO
 
3
]
 
2
Essential elements:B, Mn, O
All elements listed in formula:B, Mg, Mn, O
Common Impurities:Mg

Relationship of Jimboite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AA.05Sassolite
H
 
3
BO
 
3
6.AA.15Nordenskiöldine
CaSn
4+
 
[BO
 
3
]
 
2
6.AA.15Tusionite
Mn
2+
 
Sn
4+
 
[BO
 
3
]
 
2
6.AA.35Kotoite
Mg
 
3
[BO
 
3
]
 
2
6.AA.40Takedaite
Ca
 
3
[BO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:

- +
9.7.1Pinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
9.7.2Orthopinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
9.7.4Sussexite
(Mn
2+
 
,Mg)
 
2
[(OH)(B
 
2
O
 
4
(OH))]
9.7.5Wiserite
(Mn,Mg)
 
14
[Cl|(OH)
 
8
|(Si,Mg)(O,OH)
 
4
|(B
 
2
O
 
5
)
 
4
]
9.7.6Kurchatovite
Ca(Mg,Mn
2+
 
)[B
 
2
O
 
5
]
9.7.7Clinokurchatovite
Ca(Mg,Fe
2+
 
,Mn
2+
 
)[B
 
2
O
 
5
]
9.7.8Takéuchiite
(Mg,Mn
2+
 
)
 
2
(Mn
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
9.7.9Blatterite
(Mn
2+
 
,Mg)
 
2
(Mn
3+
 
,Sb
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
9.7.10Tusionite
Mn
2+
 
Sn
4+
 
[BO
 
3
]
 
2

Other Names for Jimboite

Synonyms:
IMA1963-002
Other Languages:
German:Jimboit
Japanese:神保石
Russian:Джимбоит
Spanish:Jimboita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Jimboite

Reference List:American Mineralogist (1963): 48: 1416.

Soviet Physics – Crystallography: 23: 272-273 (1978)

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Jimboite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Jimboite in the Natural History Museum (London) online catalogue
  • Jimboite details from Handbook of Mineralogy (PDF)
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    Localities for Jimboite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Fukui Prefecture
          • Wakasa
    		National Science Museum (Tokyo) specimen
      • Kanto Region
        • Tochigi Prefecture
          • Kanuma
    		Watanabe et al (1963) Proceedings of the Japan Academy, series B, 39, 170-175.
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