Janggunite
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Formula:
Mn5-x(Mn,Fe)1+xO8(OH)6
Colour:
black
Lustre:
Dull
Hardness:
2 - 3
Specific Gravity:
3.59
Crystal System:
Orthorhombic
Name:
Named in 1977 by Soo Jin Kim for the type locality of Janggun mine, South Korea.
This page provides mineralogical data about Janggunite.
Classification of Janggunite
Approved
Approval Year:
1975
4/D.13-10
4.FG.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
6.4.7.1
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
7.19.2
7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
Physical Properties of Janggunite
Dull
Colour:
black
Streak:
brownish black to dark brown
Hardness:
2 - 3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Fragile
Cleavage:
Perfect
one direction
one direction
Density:
3.59 g/cm3 (Measured) 3.58 g/cm3 (Calculated)
Optical Data of Janggunite
Type:
Biaxial
Type:
Anisotropic
Anisotropism:
very strong, yellowish brown with bluish tint
Colour in reflected light:
grayish white to gray
Chemical Properties of Janggunite
Formula:
Mn5-x(Mn,Fe)1+xO8(OH)6
IMA Formula:
(Mn4+,Mn2+,Fe3+)6O8(OH)6
Elements listed:
Crystallography of Janggunite
Crystal System:
Orthorhombic
Cell Parameters:
a = 9.324 Å, b = 14.05 Å, c = 7.956 Å
Ratio:
a:b:c = 0.664 : 1 : 0.566
Unit Cell V:
1,042.25 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.34 | (s) |
| 7.09 | (s) |
| 4.62 | (m) |
| 4.17 | (m) |
| 3.547 | (s) |
| 3.101 | (s) |
| 2.469 | (m) |
Type Occurrence of Janggunite
Synonyms of Janggunite
Other Language Names for Janggunite
Related Minerals - Nickel-Strunz Grouping
| 4.FG.10 | Cesàrolite | Pb(Mn4+)3O6(OH)2 | |
| 4.FG.15 | Kimrobinsonite | (Ta,Nb)(OH)5-2x(O,CO3)x ; x near 1.2 | Iso. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
| 7.19.1 | Bixbyite | Mn3+2O3 | Iso. m3 (2/m 3) : Ia3 |
| 7.19.3 | Jacobsite | Mn2+Fe3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| 7.19.4 | Vernadite | (Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O | Hex. |
| 7.19.5 | Galaxite | Mn2+Al2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| 7.19.6 | Filipstadite | (Sb0.5Fe0.5)Mn2O4 | Iso. |
| 7.19.7 | Manganochromite | Mn2+Cr2O4 | |
| 7.19.8 | Zenzénite | Pb3Fe4Mn3O15 | Hex. |
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.
References for Janggunite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kim, S.J. (1977) Janggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea. Mineralogical Magazine: 41: 519-523.
Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1978) New mineral names. American Mineralogist: 63: 424-427.
Fleischer, M., Pabst, A., White, J.S. (1978) New mineral names. American Mineralogist: 63: 793-796.
Internet Links for Janggunite
mindat.org URL:
https://www.mindat.org/min-2073.html
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Please feel free to link to this page.
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Localities for Janggunite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for 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.
France | |
| Jambor, J.L. and Roberts, A.C. (2001) New mineral names. American Mineralogist: 86: 197-200.; Mineralogical Record 32: 312. |
Morocco | |
| Force, E.R., Back, William, Spiker, E.C., and Knauth, L.P. (1986): A ground-water mixing model for the diagenesis of the Imini manganese deposit (Cretaceous) of Morocco: Economic Geology, 81, 65-79. |
| Econ Geol (1986) 81:65-79 | |
| Econ Geol (1986) 81:65-79 | |
South Korea (TL) | |
| J.Korean Inst.Mining Geol.(1975) 8, 117-125 |