Jimboite Mineral Data

General Jimboite Information

Chemical Formula:

Mn3B2O6

Composition:

Molecular Weight = 282.43 gm

Manganese 58.36 % Mn 75.35 % MnO

Boron 7.65 % B 24.65 % B₂O₃

Oxygen 33.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃B₂O₆

Environment:

Likely formed by metasomatic reactions between boron-bearing hydrothermal solutions and rhodochrosite in banded manganese deposits.

IMA Status:

Approved IMA 1963

Locality:

Kaso mine, Kanuma, Tochigi Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Kotora Jimbo (1867-1924), founder of the Mineralogical Institute, University of Tokyo, Tokyo, Japan.

Name Pronunciation:

Jimboite

Synonym:

ICSD 34561

PDF 19-781

Jimboite Image

Images:

Jimboite

Comments: Dark red-brown crystalline jimboite veinlet in massive rhodochrosite.
Location: Rito Mine, Azuma Mura, Seta-gun, Gumma, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jimboite Crystallography

Axial Ratios:

a:b:c =0.6471:1:0.532

Cell Dimensions:

a = 5.64, b = 8.715, c = 4.637, Z = 2; V = 227.92 Den(Calc)= 4.12

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnmn,Pmmn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.78(1), 2.59(0.5), 2.33(0.4),

Crystal Structure:

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Effenberger H , Pertlik F , Zeitschrift fur Kristallographie , 166 (1984) p.129-140, Verfeinerung der kristallstrukturen der isotypen verbindungen, M3(BO3)2 mit M=Mg, Co und Ni (strukturtyp: kotoit), Locality: synthetic

Physical Properties of Jimboite

Cleavage:

{110} Perfect

Color:

Light purple brown, Reddish brown.

Density:

3.98

Diaphaneity:

Transparent

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Jimboite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1947,KPDmeas= 0.2016,KC= 0.2014
Ncalc = 1.8 - 1.83

Optical Data:

Biaxial (+), a=1.792, b=1.794, g=1.821, bire=0.0290, 2V(Calc)=32, 2V(Meas)=30.

Calculated Properties of Jimboite

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Jimboite =3.98 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Jimboite= 15.36 barns/electron
U=PE_Jimboite x rElectron Density= 57.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jimboite is Not Radioactive

Jimboite Classification

Dana Class:

24.03.02.02 (24)Borates - Anhydrous

(24.03)where (A)m (B)n [XO3]p

(24.03.02)Dana Group

24.03.02.01 Kotoite Mg3B2O6 Pnmn 2/m 2/m 2/m

24.03.02.02 Jimboite Mn3B2O6 Pnmn,Pmmn 2/m 2/m 2/m

Strunz Class:

06.AA.35 06 - BORATES

06.A - Monoborates

06.AA -BO3, without additional anions; 1(D)

06.AA.35 Jimboite Mn3B2O6 Pnmn,Pmmn 2/m 2/m 2/m

06.AA.35 Kotoite Mg3B2O6 Pnmn 2/m 2/m 2/m

Other Jimboite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Jimboite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Jimboite Specimen Label here :

Jimboite

Mn3B2O6
Dana No: 24.03.02.02 Strunz No: 06.AA.35
Locality:

Notes: