Mineralogy Database

Janggunite Mineral Data

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General Janggunite Information

Help on Chemical  Formula: Chemical Formula: Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2
Help on Composition: Composition: Molecular Weight = 559.85 gm
   Manganese  56.92 %  Mn   12.67 % MnO / 74.54 % MnO2
   Iron        2.00 %  Fe    2.85 % Fe2O3
   Hydrogen    1.08 %  H     9.65 % H2O
   Oxygen     40.01 %  O
             ______        ______ 
             100.00 %       99.71 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn4+4.8Mn2+Fe3+0.2O8(OH)6
Help on Environment: Environment: In the zone of supergene manganese oxides.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Janggun mine, Bonghwa, Korea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Janggunite + Pronunciation Say JANGGUNITE

Janggunite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6636:1:0.5662
Help on Cell Dimensions: Cell Dimensions: a = 9.324, b = 14.05, c = 7.956, Z = 4; V = 1,042.25 Den(Calc)= 3.57
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.34(1), 7.09(0.5), 3.547(0.4),

Physical Properties of Janggunite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Black.
Help on Density: Density: 3.59
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Fragile - Crystals with a delicate and easily injured structure.
Help on Habit: Habit: Colloform - Forming from a gel or colloidal mass.
Help on Habit: Habit: Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: brownish black

Optical Properties of Janggunite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.3605) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.3605) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Very strong, bluish or brownish.
Help on RL Color: RL Color: Grayish white.
Help on RL Pleochroism: RL Pleochroism: Distinct, whitish to light gray in oil.

Calculated Properties of Janggunite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Janggunite =3.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006166202
Boson Index = 0.9993833798
Help on Photoelectric: Photoelectric: PEJanggunite = 15.36 barns/electron
U=PEJanggunite x rElectron Density= 52.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Janggunite is Not Radioactive

Janggunite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.04)containing multiple cations
  (06.04.07)Dana Group Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho
Help on  Strunz Class: Strunz Class: 04.FG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FG -Hydroxides with OH, without H2O; unclassified
04.FG.05 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho

Other Janggunite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Janggunite :
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

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


Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2
Dana No: Strunz No: 04.FG.05





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