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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.


Hide all sections | Show all sections

Classification of JangguniteHide

Approved
Approval Year:
1975
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
6.4.7.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
7.19.2

7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe

Physical Properties of JangguniteHide

Colour:
black
Streak:
brownish black to dark brown
Hardness:
2 - 3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Fragile
Cleavage:
Perfect
one direction
Density:
3.59 g/cm3 (Measured)    3.58 g/cm3 (Calculated)

Optical Data of JangguniteHide

Type:
Biaxial
Type:
Anisotropic
Anisotropism:
very strong, yellowish brown with bluish tint
Colour in reflected light:
grayish white to gray

Chemical Properties of JangguniteHide

Formula:
Mn5-x(Mn,Fe)1+xO8(OH)6
IMA Formula:
(Mn4+,Mn2+,Fe3+)6O8(OH)6

Crystallography of JangguniteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.34 (s)
7.09 (s)
4.62 (m)
4.17 (m)
3.547 (s)
3.101 (s)
2.469 (m)

Type Occurrence of JangguniteHide

Synonyms of JangguniteHide

Other Language Names for JangguniteHide

German:Janggunit
Simplified Chinese:羟黑锰矿
Spanish:Janggunita
Traditional Chinese:羥黑錳礦

Related Minerals - Nickel-Strunz GroupingHide

4.FG.10CesàrolitePb(Mn4+)3O6(OH)2
4.FG.15Kimrobinsonite(Ta,Nb)(OH)5-2x(O,CO3)x ; x near 1.2Iso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.19.1BixbyiteMn3+2O3Iso. m3 (2/m 3) : Ia3
7.19.3JacobsiteMn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.19.4Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2OHex.
7.19.5GalaxiteMn2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.19.6Filipstadite(Sb0.5Fe0.5)Mn2O4Iso.
7.19.7ManganochromiteMn2+Cr2O4
7.19.8ZenzénitePb3Fe4Mn3O15Hex.

Other InformationHide

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 JangguniteHide

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 JangguniteHide

Localities for JangguniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Guillaumes
        • Daluis
Jambor, J.L. and Roberts, A.C. (2001) New mineral names. American Mineralogist: 86: 197-200.; Mineralogical Record 32: 312.
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Imini area
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)
 
  • Gyeongsangbuk-do (Kyongsang-bukto; Gyeongsangbugdo)
    • Bonghwa-gun
J.Korean Inst.Mining Geol.(1975) 8, 117-125
Mineral and/or Locality  
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