Janggunite Mineral Data

General Janggunite Information

Chemical Formula:

Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2

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

Empirical Formula:

Mn⁴⁺_4.8Mn²⁺Fe³⁺_0.2O₈(OH)₆

Environment:

In the zone of supergene manganese oxides.

IMA Status:

Approved IMA 1977

Locality:

Janggun mine, Bonghwa, Korea. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Janggunite + Pronunciation

Search for Janggunite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Janggunite Crystallography

Axial Ratios:

a:b:c =0.6636:1:0.5662

Cell Dimensions:

a = 9.324, b = 14.05, c = 7.956, Z = 4; V = 1,042.25 Den(Calc)= 3.57

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 9.34(1), 7.09(0.5), 3.547(0.4),

Physical Properties of Janggunite

Cleavage:

{???} Indistinct

Color:

Black.

Density:

3.59

Diaphaneity:

Opaque

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Colloform - Forming from a gel or colloidal mass.

Habit:

Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).

Habit:

Flakes - Flat, thin crystals or aggregates.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Earthy (Dull)

Streak:

brownish black

Optical Properties of Janggunite

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

RL Anisotrophism:

Very strong, bluish or brownish.

RL Color:

Grayish white.

RL Pleochroism:

Distinct, whitish to light gray in oil.

Calculated Properties of Janggunite

Electron Density:

Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Janggunite =3.57 gm/cc.

Fermion Index:

Fermion Index = 0.0006166202
Boson Index = 0.9993833798

Photoelectric:

PE_Janggunite= 15.36 barns/electron
U=PE_Janggunite x rElectron Density= 52.53 barns/cc.

Radioactivity:

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

Janggunite Classification

Dana Class:

06.04.07.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.04)containing multiple cations

(06.04.07)Dana Group

06.04.07.01 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

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

Search for Janggunite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Janggunite :

A Bijoux Google Search for Janggunite
Adam's Minerals Google Search for Janggunite
Cape Minerals Google Search for Janggunite
Dakota Matrix Minerals Google Search for Janggunite
Excalibur Mineral Corp. Google Search for Janggunite
Exceptional Minerals Google Search for Janggunite
John Betts Fine Minerals Search for Janggunite
McDougall Minerals Google Search for Janggunite
Mineral News Website Link
Rock and Mineral Shows Google Search for Janggunite
Weinrich Minerals, Inc. Google Search for Janggunite

Ask about Janggunite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Janggunite

Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2
Dana No: 06.04.07.01 Strunz No: 04.FG.05
Locality:

Notes: